Where can I find a crosswalk between IPUMS OCC and NHIS OCCUPN1?

#1

Where can I find a crosswalk between IPUMS OCC and NHIS OCCUPN1? OCCUPN2 would also be helpful.

#2

The appendix of this document shows how the coding scheme of the OCC variable found in IPUMS Health Surveys is re-coded into the two-digit OCCUPN. The sub-categories correspond to OCCUPN1 and the general categories correspond to OCCUPN2.

I hope this helps.