Punch Cards for a Chemical Bibliography

Punch card techniques and applications.

“…Diagnostic file used by a tuberculosis league located in a large city. 4. File for keeping obstetrical case histories.…”

“…Since writing our first paper (4) we have developed several new procedures for the better preparation and manipulation of punch cards for bibliography.…”

Punch-Card Information Retrieval Systems for Flashblindness Protection Research. I. Photochromic Materials.

“…To remove the O-slotted cards that have dropped down part way, remove the needle from the original hole and needle one of the unmarked corner holes, or vice versa if more than one needle is available, and again let the free cards fall. 6. When retrieving information coded indirectly by a numerical code such as the 7-4-2-1, it may be necessary to needle all the holes in a particular coding block if the code number is 7, 4, 2, or 1.…”