What is value of 1950 first edition Colliers Encyclopedia?

A 1958 Collier's encyclopedia is not even worth its shipping cost and this is not a new situation. In 1980 (before the internet) I went to a used book store in New Orleans with my set and the proprietor of the shop showed me other Collier's sets for sale in his store; their price was rock bottom low even then.

I gave the set to my girlfriend at the time; who was a school teacher. She put them in her classroom for her students to use. Nowadays, with the internet, they would not have even that use.