Air Force Project Blue Book Special Report 14 (Hynek's annotated copy)

Read from the scan by GLM-OCR; expect the odd misread word.

ERVATION - A SIGHTING consisting of a single report from (1) one OBSERVER with no knowledge of additional OBSERVERS of the same phenomenon, or (2) a group of witnesses of the same phenomenon, each cognizant of the others. The witness who made the report is called a SINGLE OBSERVER.

MULTIPLE OBSERVATION - A SIGHTING consisting of several reports from OBSERVERS of the same phenomenon who were cognizant of each other. The witnesses who made reports are called MULTIPLE OBSERVERS.

ALL SIGHTINGS - (1) The group of reports consisting of one report for each OBSERVER, including both SINGLE and MULTIPLE OBSERVERS. (2) The questionnaire, work sheet, and IBM card representing the report from each OBSERVER in other words, the representation of each report accepted for the statistical study.

UNIT SIGHTINGS - (1) The group of reports consisting of one report for each SIGHTING, including all the reports of SINGLE OBSERVATIONS and the one most representative report from each MULTIPLE OBSERVATION. (2) The questionnaire, work sheet, and IBM card representing the report for each SIGHTING accepted for the statistical study.

A major serial number (four digits) was assigned to each sighting, segregating the year of occurrence by selection of limits for each year, as follows:

$$
0 0 0 1 \mathrm {t o} 0 5 0 0 \mathrm {r e s e r v e d f o r} 1 9 4 7
$$

$$
0 5 0 1 \mathrm {t o} 1 0 0 0 \mathrm {r e s e r v e d f o r} 1 9 4 8
$$

$$
1 0 0 1 \mathrm {t o} 1 5 0 0 \mathrm {r e s e r v e d f o r} 1 9 4 9
$$

$$
1 5 0 1 \mathrm {t o} 2 0 0 0 \mathrm {r e s e r v e d f o r} 1 9 5 0
$$

$$
2 0 0 1 \mathrm {t o} 2 5 0 0 \mathrm {r e s e r v e d f o r} 1 9 5 1
$$

$$
2 5 0 1 \mathrm {t o} 4 9 0 0 \mathrm {r e s e r v e d f o r} 1 9 5 2
$$

While this scheme would serve to identify any individual sighting, identification of each report and its subsequent forms was necessary. The minor subserial numbers (two digits) fulfilled this requirement. For all SINGLE OBSERVATIONS, a major serial number followed by two (2) zeros, for example, 2759.00, was sufficient identification. For MULTIPLE OBSERVATIONS, the major serial number followed by a series of two-digit numbers ranging from 00 to 99 was used to identify the individual reports. In general, the most complete report from the most reliable observer of that