The Gods of Mars

Grosset & Dunlap reprinted the title from 1919 onward: the G&D imprint appears at the spine foot and on the title page, and the early Burroughs G&D reprints are bound in the house tan-grey cloth with darker lettering rather than McClurg's red cloth — cloth colour plus imprint is the fastest tell. Separately, later McClurg printings (through 1919) retain the McClurg imprint but lack the W. F. Hall printing credit; these are the copies most often mis-sold as firsts.