Problems of bird-migration.

London: H. F. & G. Witherby, 1926. Octavo, bookplate, signature, a little spotting, otherwise a near fine copy in a slightly chipped printed dustwrapper, scarce in this condition.
.
London: H. F. & G. Witherby, 1926. Octavo, bookplate, signature, a little spotting, otherwise a near fine copy in a slightly chipped printed dustwrapper, scarce in this condition.
.