To get a name of the item, go to the line with the item number in the fields file. (count starts from 1 I believe)
The name of the item is a (name, value) pair. To get a description take a look at the my.fields file. Note that some numerical parameters have been bucketized into other values. Hope this helps and let me know if there are problems. Note I haven't touched this in a while and I may have forgotten something important.
Notes: lots of disclaimers apply to this data. Also, sorry but I haven't been able to make the larger Arizona data set available.