NCAS EDITORS' NOTE: Square brackets indicate differences between actual chapter titles and what appears in the TOC.
| LETTER OF TRANSMITTAL | iii | |
| PREFACE | v | |
| SECTION I | Conclusions and Recommendations | 2 |
| SECTION II | Summary of the Study | 10 |
| SECTION III | The Work of the Colorado Project | 72 |
| Chapter 1 | Field Studies | 73 |
| Chapter 2 | Analysis of UFO Photographic Evidence | 108 |
| Chapter 3 | Direct Physical Evidence | 128 |
| Chapter 4 | Indirect Physical Evidence | 146 |
| Chapter 5 | Optical and Radar Analysis of Field Cases | 173 |
| Chapter 6 | Visual Observations Made by U.S Astronauts | 268 |
| Chapter 7 | Attitude Survey | 315 |
| SECTION IV | Case Studies | 364 |
| Chapter 1 | Case Studies Predating the Term of the Project | 365 |
| Chapter 2 | Case Studies During the Term of the Project | 427 |
| Chapter 3 | Photographic Case Studies | 606a |
| PHOTOGRAPHIC PLATES AND FIGURES | 737 | |
| NON-PHOTOGRAPHIC FIGURES | n/a | |
| SECTION V | Historical Aspects of UFO Phenomena | 812 |
| Chapter 1 | UFOs in History | 813 |
| Chapter 2 | UFOs, 1947-1968 | 844 |
| Chapter 3 | Official UFO Study Programs in Foreign Countries | 921 |
| SECTION VI | The Scientific Context | 929 |
| Chapter 1 | Perceptual Problems | 930 |
| Chapter 2 | Processes of Perception, Conception and Reporting | 943 |
| Chapter 3 | Psychological Aspects of [the] UFO Reports | 976 |
| Chapter 4 | Optics [Optical Mirage] | 987 |
| Chapter 5 | Radar [and the Observation of UFOs] | 1059 |
| Chapter 6 | Sonic Boom | 1146 |
| Chapter 7 | Atmospheric Electricity and Plasma Interpretations of UFOs | 1156 |
| Chapter 8 | Balloons [- Types, Flight Profiles and Visibility] | 1205 |
| Chapter 9 | Instrumentation for UFO Searches | 1214 |
| Chapter 10 | Statistical Analysis | 1271 |
| SECTION VII | Appendices | 1279 |
| A | Special Report of the USAF Scientific Advisory Board Ad Hoc Committee to Review Project "Blue Book", March 1966 | 1280 |
| B | AFR 80-17A, Unidentified Flying Objects | 1291 |
| C | Presentation at Arizona Academy of Science Meeting, 29 April 1967 by Gerard Kuiper, Lunar and Planetary Laboratory, University of Arizona | 1309 |
| D | Letter - J. E. Lipp to Brigadier General Putt - Project "SIGN", No. F-TR-2274-IA, Appendix D | 1316 |
| E | Report on Numerical Experiment on the Possible Existence of an "Anti-Earth," by Dr. R. L. Duncombe, U. S. Naval Observatory | 1326 |
| F | FAA Notice N7230.29 | 1328 |
| G | U. S. Weather Bureau Operations Manual, Letter 67-16 | 1330 |
| H | U. S. Dept. of Agriculture Forest Service, Rocky Mtn Region, Memorandum to Forest Supervisors | 1331 |
| I | Individuals Who Participated in the Early Warning Network | 1333 |
| J | Early Warning Report Form | 1335 |
| K | Field Kit Inventory List | 1336 |
| L | Weather Conditions and Radar Echoes near Washington, D.C., and Norfolk, Va., on 19-20 and 26-27 July 1952 | 1337 |
| M | Sources of College Survey Data and Persons Instrumental in Obtaining Data | 1345 |
| N | UFO Opinion Questionnaire | 1346 |
| O | A-B Scale | 1349 |
| P | Current Events Questionnaire | 1353 |
| Q | Weather Conditions in the Area Between Dallas and Mineral Wells, Texas, 19 September 1957 | 1355 |
| R | Letter from General N. F. Twining to Commanding General, Army Air Forces, 23 September 1947 | 1379 |
| S | Directive - Major General L. C. Craigie to Commanding General, Wright Field (Wright-Patterson AFB) - Disposition and Security for Project"SIGN", dated 30 December 1947 | 1382 |
| T | G. E. Valley - Interpretation of Reports of Unidentified Flying Objects, Project "SIGN", F-TR-2274-IA, Appendix C | 1384 |
| U | Report of Meetings of Scientific Advisory Panel on Unidentified Flying Objects (Robertson Panel), 14-18 January 1953 | 1392 |
| V | Natural Philosophy of Flying Saucers | 1422 |
| W | Acknowledgments | 1428 |
| X | Editors and Authors, Staff of the Colorado Project | 1433 |
| INDEX | 1439 | |
| ERRATA | n/a | |