Roy Tennant sampled 856 fields in MARC records to see whether there is a reliable method of determining the availability of the full text access based on the coding the the 856.  His results show wide variablity in the coding, and he argues for one consistant method to code for full text.

Simple tool will create a MARC record based on the Amazon metadata.  Just insert the ASIN (Amazon Standard Identification Number = ISBN or other standard number).   Subjects and name headings are a bit suspect, but the descriptive looks OK.   I didn't try the download feature, so I'm not sure if the records are true MARC (to move to another system).

The following crosswalk was done by Elizabeth Mangan, Geography and Map Division, Library of Congress.