Picked up some new, to me anyways, information on AUTOCAT about field 040, Cataloging Source. Subfield a is optional but subfield c is mandatory. Who would have guessed? LC practice is to copy subfield a to c if the latter is missing. There is a code for Undetermined Organization (Undetermined City, Undetermined), XX-XxUND. That would work when both are missing.If you are not reading AUTOCAT you are missing out on some interesting discussions and bits of information. It is a busy e-mail list, I get the daily digest.