When reading or transcribing old documents I have found these sites quite useful:
http://home.comcast.net/~modean52/oeme_dictionaries.htm the New Dictionaries website. From here you can find both Old to Modern and Modern to Old English Dictionaries. Finished Dictionaries are colored green/blue, and those cross-referenced with Bosworth & Toller are orange.
http://www.mun.ca/Ansaxdat/vocab/wordlist.html#b gives a list which shows modern English translated to Old English