George I'm with you 100% on the new and improved USAMHI site. Very, very difficult to navigate. I imagine they used the same contractor for the Obamacare rollout. Searches appear to go nowhere but somehow one night I stumbled on the Unit Bibliographies that I used to use. Here are the links but I still have no idea how to get to these from the main site itself.
Wayne

Unit Bibliographies
http://cdm16635.contentdm.oclc.org/cdm/landingpage/collection/p16635coll9

Louisiana Bibliographies
http://cdm16635.contentdm.oclc.org/cdm/search/collection/p16635coll9/searchterm/Civil%20War%20Confederate%20Units!Louisiana/field/all!all/mode/all!all/conn/and!and/order/title/ad/asc

Now I went ahead and got the Austin's Battalion page but it appears to be very generic
http://cdm16635.contentdm.oclc.org/utils/getfile/collection/p16635coll9/id/9024/filename/9025.pdf

Hope this helps.