National Audubon Society COMPLETE set of 50 postcards Winter Birds N. America

National Audubon Society....COMPLETE set of 50 postcards..."Winter Birds of Eastern North America"....front of the card features a bird, on the backside is information about that particular bird. Several of these are signed Allan Brooks...ornithologist and bird artist also featuring Roger Tory Peterson and one other artist I can see.

Size: 3 1/2" x 5 1/2" Era: not linen but vintage Manufacturer/Publisher : The National Audubon Society 1130 Fifth Avenue, New York 28, New York Not really to be used as a mailable postcards, used as field Guides and Learning Flash Cards. Condition: Very Fine -, almost not bumps at all, no damage, not creases no ink marks. photos show general overall condition with minimal edge wear consistant with age Family Owned c. the 1940’s Spring Birds of North America - Complete Set of 50 CardsAudubon Societies 1950s.Beautiful drawings by Allan BrooksCards are 3 1/2" X 5 1/2"The only remaining piece of the original box is the top - shown in photo #1...not very good condition but some portions are legible.See info below from research:The ACC lists 2 of the series - Winter Birds (W637) and Summer Birds (W638). However, 4 different sets were issued (there was also Spring Birds and Birds of Western North America). It appears the first 3 sets (Winter Birds - series 1, Spring Birds - series 2, and Summer Birds - series 3) came out at the same time and were issued several times over the years. All of these series list the NY address with no zip codes and some v