I reckon it's likely to be an Exclusive author, given it's published by Morrish.
Friday, Mar 6, 2020 : 21:33
Marty said ...
B. (F. W. ) The discovery of San Salvador. [By] (F.W.B.) (London, G. Morrish,) [n.d.] 4p. 6.5". (GC43665) (Cambridge Tracts for the Young, Series III, No.2.) 9312