Order

This is part of my library. 24 volumes of the Brockhaus encyclopaedia we received as a gift at our wedding, back in December 1990. At that time quite valuable, nowadays Wikipedia offers much more.
The other books are an animal encyclopaedia, even older, a small 4-volume encyclopaedia (kind of pocket form with not so much information), and a medical encyclopaedia. Latter three are more general.
Thanks to jensphotos for hosting the Mono Monday challenge.