Robert, J.H. — Pieridae de Ecuador.

ca. 1974 [10], 22, [1] p., 21 coloured plates (original photographs), 4to, in one album within plastic sheets. Unpublished manuscript consisting of typed text and original photographs. The photographs with handwritten numbers and somewhat discoloured (or perhaps the photo quality at the time was not that good). Inserted in a rear pocket are three xerox-copies of letters by Robert dated 1974 (one become unreadable). Rare.