I. C. S. reference library : a series of textbooks prepared for the students of the international correspondence schools and containing in permanent form the instruction papers, examination questions, and keys used in their various courses
- s.l. Scranton International Textbook Company 19--
- VI, 27, 31, 31, 30, 33, 39, 25, 27, 36, 43, 39, 43, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, XXX p. 22 cm.
Cada lección tiene su paginación. Encuadernación en keratol con lomo y orillas en piel. Sello en tinta del Oratorio de San Felipe Neri de México. Biblioteca La Profesa, D.F.