Looking for Frankenhauser-Huxley solution program

[HP67lover]

I'm looking for a listing of a program that was in the HP-67 User's Library, probably published around 1977 or 1978. It's a solution to the Frankenhauser-Huxley differential equations that describe the current-voltage relationship of a single node of Ranvier of a myelinated nerve axon.

I'd like to key it in to the HP-67 Pro iOS simulator on my iPad (http://cuveesoft.ch/rpn67/). I know this is a long shot, but does anyone know of a place where listings from the old User's Library are available?

Thanks.