| Introduction to the Science of Sociology
Robert Ezra Park; E. W. Burgess | |
| Introduction to the scientific study of education
Charles Hubbard Judd | |
| Introduction to the study of history
Charles Victor Langlois; Charles Seignobos | |
| Introduction to the Study of Palæontological Botany
John Hutton Balfour | |
| Introduction to the study of the history of language
Herbert A. Strong; Willem Sijbrand Logeman; Benjamin Ide Wheeler | |
| Introductory American History
Henry Eldridge Bourne; Elbert Jay Benton | |
| Introductory notes on lying-in institutions
Florence Nightingale | |
| Invader From Infinity
George A. Whittington | |
| Invaders from the Infinite
Jr. John W. Campbell | |
| Invaders of the Forbidden Moon
Raymond Z. Gallun |
