I. C. S. Reference library a series of textbooks prepared for the students of the international correspondence school and containing in permanent form the instruction papers, examination questions, and keys used in their various courses : arithmetic, elementary algebra, mensuration, physics

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• 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
• 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
• 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
• 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
• 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