1951 1420 p., 1 folded map, publisher's cloth. Library stamps and M.A. Lieftinck’s signature, first inner joint weak.A massive synoptical catalogue on Hymenoptera. The map shows the faunal zones of North America.
1951 1420 p., 1 folded map, publisher's olive buckram. A massive synoptical catalogue on Hymenoptera. The map shows the faunal zones of North America. Library stamp on front pastedown, otherwise good.
1951-1967 Three volumes in three. 2307 [1420, 303, 584] p., 1 map, publisher's printed buckram (main work and first supplement), contemporary cloth with gilt title (second supplement). A massive work underscoring the importance of the parasitic Hymenoptera to the agriculture of North America. A very good set.