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File consists of photographs of Douglas (Doug) Sadler birding.

This addition to the fonds consists of field naturalist newsletters and journals from across Ontario, with many of the publications including illustrations. Also included in the fonds are numerous bird spotting forms and error forms for the Ontario breeding bird atlas.

File includes record cards, rejected or modified unusual species report forms, and error report forms for the Ontario Breeding Bird Atlas from 1980 to 1986.