COLLINGWOOD CA   1978

A Provisional list of Iberian Formicidae with a key to the Worker Caste. (Hym. Aculeata).

Publ. en EOS, Revista Espanola de Entomol., Tomo LII, p. 65-95, brosch., priv sign., m. Anstreichungen

COLLINGWOOD CA   1979

The Formicidae (Hymenoptera) of Fennoscandia and Denmark.

Fauna Entomol. Scand. Vol 8, 174 S., m. zahlr. Fig, Hardcover, sehr schönes Expl.