Sub-series consists of photographs of Ontario documenting the administration of public lands and development and conservation of their natural resources. The photographic sub-series was originally compiled from both federal and provincial sources including numerous sub-agencies and survey branches of the Department of the Interior. Photographs were also acquired from private sources and independent photographers from Ontario and across Canada. The sub-series is organized alpha-numerically as follows.
O-1 series consists of photographs documenting agricultural production and development in Ontario. Sources include the Immigration and Colonization Branch and the Trade and Commerce Branch of the Department of the Interior. Photos by the Field Husbandry Division of the Central Experimental Farm, Ottawa, Mr. James (1928), Mr. Siebert (1928), Mr. Nunnick (1928), S.T. Little, John Woodruff and other sources.
O-2 series consists of photographs documenting forestry, forest reserves, pulp and paper production across Ontario. Sources include the Forestry Services Branch of the Department of the Interior. Photos by the Ontario Provincial Picture Bureau, Canadian Pacific Railway Company, Canadian International Paper Company, Mr. Slusser (1927) and other sources.
O-3 series consists of one photograph documenting the Wright Hargraves Gold Mine at Kirkland Lake, Ontario. Photo by Wright Hargraves.
O-4 series consists of photographs documenting fisheries reserves, production and industry in Ontario, primarily at Lake Superior. No sources or photographers are indicated.
O-5 series consists of photographs documenting wildlife reserves in Ontario. Sources include the Trade and Commerce Branch of the Department of the Interior. Photos by the Ontario Provincial Tourist and Publicity Bureau, Whitehill Fur Farms, Manley F. Miner of Kingsville, Ontario and other sources.
O-6 series consists of photographs documenting bird species, primarily in Southwestern Ontario. Photos of bird watching at Long Point National Park. Sources include the National Parks Branch of the Department of the Interior. Photos by A.D. Sloane of Leamington, Ontario, Manley F. Miner of Kingsville, Ontario, Roy Studio at Peterborough, Ontario and other sources.
O-7 series consists of photographs documenting flowers and other horticultural specimens in Ontario. No sources or photographers are indicated.
O-8 series consists of photographs documenting scenery across Ontario. Sources include the Immigration and Colonization Branch of the Department of the Interior. Photos by the Canadian Travel Bureau, Ontario Provincial Tourist Bureau, Hamilton Industrial Department, Canadian National Railway Company, Chamber of Commerce at Port Arthur, Fort William Board of Trade, "Rod and Gun" Magazine (1928), G.C. Everett, M.J. O'Brien, J. Dobie (1927), Mr. Slusser (1927), Mr. Hore, Bishop Dewdney at Red Lake, Ontario and other sources.
O-9 series consists of one photograph documenting the plant and stockyards at the Swift Canadian Company at Toronto, Ontario. Photo originally used by the Trade and Commerce Branch of the Department of the Interior. No photographer is indicated.
O-11 series conisist of photographs documenting hydro electric development, resources and facilities accross Ontario. Sources include the Water Power and Reclamation Branch of the Department of the Interior. Photos by the Hydro Electric Commission of Ontario, Canadian Niagara Water Company Plant, Spruce Falls Power and Paper Company, Gatineau Power Company, Ontario Provincial Picture Bureau, Quaker Oats Company, M.J. O'Brien, G.A. Wilson and other sources.
O-12 series consists of photographs documenting transportation networks, development and services accross Ontario. Sources include the Trade and Commerce Branch, Railways and Canals Branch, and the Immigration and Colonization Branch of the Department of the Interior. Photos by the Post Office Department, Ottawa, Toronto Industrial Commission, Canada Cement Company, Hamilton Industrial Department, Detroit International Bridge Company, Canadian National Railway Company, Ontario Provincial Tourist Bureau, G.G. Ommaney for the Canadian Pacific Railway Company, Fort William Board of Trade, E. Farrington of Hudson, Ontario, Lovelady Studios of Port Arthur, Ontario, W.T. Curran of Montreal, Quebec, Bishop Dewdney at Sioux Lookout, Pringle and Booth of Toronto and other sources.
O-13 series consists of photographs documenting aboriginal communities and culture across Ontario. Photos by the Victoria Memorial Museum in Ottawa, Mr. Slusser (1927), J. Dobie (1927), Bishop Dewdney in the Algoma District, Ontario and other sources.
O-14 series consists of photographs documenting schools and educational facilities across Ontario. Sources include the Immmigration and Colonization Branch of the Department of the Interior. Photos by the Canadian National Railway Company, Hamilton Board of Trade, Hamilton Trade of Commerce, London Chamber of Commerce, Port Arthur Chamber of Commerce, G.R. Smith and other sources.
O-15 series consists of photographs documenting churches across Ontario. Photos by the Port Arthur Chamber of Commerce, Manley Miner of Kingsville, Ontario and other sources.
O-16 series consists of photographs documenting monuments and historic sites across Ontario. No sources or photographers are indicated.
O-19 series consists of photographs documenting recreation, sports and leisure across Ontario. Sources include the National Parks Branch of the Department of the Interior. Photos by Canadian Pacific Railway Company, Canadian National Railway Company, Province of Ontario Picture Bureau, Toronto Harbour Commission, Hamilton Industrial Department, Roy Studios at Peterborough, Ontario, Jack Miner, Major Ashton of Ottawa, Mr. Smith and other sources.
O-20 series consists of photographs documenting federal, provincial and municipal government buildings and services in Ontario. Photos of parliament buildings, armouries, hospitals and Royal Canadian Mounted Police facilities. Photos of the Natural Resources Intelligence Service facilities. Sources include the Immigration and Colonization Branch, Trade and Commerce Branch, National Parks Branch of the Department of the Interior. Photos by the Toronto Harbour Commission and other sources.
O-21 series consists of photographs documenting cities and towns across Ontario. Sources include the Immigration and Colonization Branch of the Department of the Interior. Photos by the Canadian Government Motion Picture Bureau, Ontario Tourist and Publicity Bureau, London Chamber of Commerce, Canadian Cement Company, Canadian National Railway Company, Mr. F. James for the Immigration and Colonization Branch, J. Dobie, E.W. Blackman of Ottawa, G.R. Smith, Hore (1925), Mr. Beneton, Lovelady Studios at Port Arthur, Ontario and other sources.
O-23 series consists of photographs documenting air views and photo-topographical mapping across Ontario. Photos by the Royal Canadian Air Force in collaboration with the Surveys Bureau of the Department of the Interior.