National Lexicographic Board

The illustrated home library encyclopedia

The New wonder book, cyclopedia of world knowledge

The New American Roget's college thesaurus in dictionary form.

Illustrated world encyclopedia

The Illustrated Home Library Encyclopedia; 8

Illustrated Home Library Encyclopedia; 2

Illustrated Home Library Encyclopedia; 1

Illustrated Home Library Encyclopedia; 15

Illustrated Home Library Encyclopedia; 5

Illustrated Home Library Encyclopedia; 4

Illustrated Home Library Encyclopedia; 7

Illustrated Home Library Encyclopedia; 14