Foster W Bert Walter Bertram 1869 1929 is not used in this library's catalog.

Joint pseudonym of Mildred A. Wirt, W. Bert Foster, and Edward Stratemeyer. For works of these authors written under their own names, as well as other names used by them, search also under Wirt, Mildred A. (Mildred Augustine), 1905-2002;  Foster, W. Bert (Walter Bertram), 1869- ;  Stratemeyer, Edward, 1862-1930  

Try a search for Emerson, Alice B.