Where can I purchase a new or used copy, hard cover or paperback of J.
T. Milik's "Books of Enoch-Aramaic Fragments from Qumran Cave 4"? It
was published in August 1976 by Oxf. UP; ISBN: 0198261616.

http://www.amazon.com has a few books by Milik.Qumran cave 4 Halakhic
texts,Discoveries in the Judea Desert Qumran Grotte 4,Qumran cave 4
Parabiblical texts,etc. I just put in the authors last name to find
them.

Book Finder is also an excellent source of both new and used books.
There does not appear to be a copy of the specific title you are
interested in listed, however you may wish to examine this list more
closely to see if, perhaps, it is included in one of the titles
available.

"J. T. Milik" (author search)
http://www.bookfinder.com/search/?author=J.+T.+Milik&title=&submit=Begin+Search&new_used=*&currency=USD&mode=basic&st=sr&ac=qr

Bookfinder
http://www.bookfinder.com

regards,
readersguide

As mentioned by pattisw, it is listed (but none are available now) at
Amazon.
You have to preorder or periodicly check it.
The Books of Enoch: Aramaic Fragments of Qumran Cave 4 by JOsef
Tadeusz, Milik
http://www.amazon.com/exec/obidos/ASIN/0198261616

This is another source of used books.  It was not listed now, but it
might show up.  As pattisw suggested, use the author's last name as a
search key.
http://www.alibris.com/home.cfm

You can also leave a search going on ebay.com.  That might turn up
something.

Dear Google Researcher.  Thank You!  I have found my book with your
help at powell books.  They had 1 copy of this rare book and I ordered
it.  conceta@optonline.net