Procedure for filing X-ray powder patterns

1. Serial number on film with India ink; on envelope (2 places) and on a blank 3x5" card having same form stamped on it.

2. Fullest possible data on envelope. Be sure to include time-meter reading (hours and tenths) for beginning of exposure, and camera number.

3. File envelope by serial number. UNDER NO CONDITIONS SHOULD ENVELOPES BE REMOVED FROM FILE BOX AFTER RECEIVING THEIR SERIAL NUMBERS.

4. Mineral name and composition on index card. File alphabetically in drawer labelled "Index to X-ray films."