Handwritten field notes in China during the years, 1897-1943

Includes notebooks, pamphlets, field notes, and other material on ornithology, mostly in China; Birds of Northeastern China by Wilder and Hugh Hubbard; correspondence of Wilder and his sons Theodore Wilder and Durand Wilder (George Durand Wilder, Jr.) and of Gertrude Stanley Wilder; volume of "Random Jottings" by Gertrude Wilder, including recollections of China missions and missionaries.