Pocket technological dictionary. In three languages.
Offinger, Heinrich.
Krenkel, H.
London, 
1929-[1931]
Part one - Volume one. German - English - Spanish. Tenth edition, revised and improved by H. Krenkel. 1931. Part one - Volume two. English - German - Spanish. Ninth edition, revised and improved by H. Krenkel. 1929. Part one - Volume three. Spanish - German - English. Ninth edition ... 1929.