- The New Encyclopedia of School Letters by P. Susan Mamchak, Steven R. Mamchak, 1990-08
- School Administrator's Complete Letter Book, Second Edition (Book & CD-ROM)
- A Treatise On Architecture And Building Construction V3: Prepared For Students Of The International Correspondence Schools (1899) by International Correspondence Schools, 2008-06-02
- Pattern making: Instruction paper (American School of Correspondence) by James Ritchey, 1916
- Lessons of the Intermediate Course: The Hebrew Correspondence School, Morgan Park, Ill by William Rainey Harper, 2010-04-02
- High School Correspondence Course and Home Study Diploma Programs in the United States and Canada by Joseph E. Smart, 1986-06
- Ford Electric Equipment (International Correspondence Schools) by C. R. Strouse, 1936
- A treatise on chemistry and chemical analysis: prepared for students of The International Correspondence Schools, Scranton, Pa
- Elements of algebra (International Correspondence Schools) by William Mason Spangler, 1953
- Correspondence Schools, Lyceums, Chautauquas by John S. Noffsinger, 2007-03-15
- Reinforced-Concrete Design (International Correspondence Schools) by Samuel Baker, 1943-01-01
- Lessons Of The Elementary Course: The Hebrew Correspondence School, Morgan Park, Illinois (1883) by William Rainey Harper, 2010-09-10
- Lessons Of The Intermediate Course: The Hebrew Correspondence School, Morgan Park, Illinois (1884) by William Rainey Harper, 2010-09-10
- Philo Gubb, Correspondence-School Detective, by Booth Tarkington, 2009-04-27
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