I AM WRITING A THESIS ABOUT PROSE AND MUSIC.  AS A REFERENCE, I WOULD
LIKE TO BE ABLE TO VIEW MOZART'S KEYBOARD MUSIC:  l2 VARIATIONS ON
"AH! VOUS DIRAE-JE MAMAN" -- IN ENGLISH THAT'S TWINKLE, TWINKLE LITTLE
STAR.

COULD YOU PLEASE TELL ME WHAT INTERNET ADDRESS WOULD TAKE ME TO THAT
MANUSCRIPT?

Here you will find sheet music in .pdf format of Mozart's Theme and 12
Variations on "Ah, vous dirai-je Maman" (KV 625). This is a 9-page
file, so it may take a while to download if you are on a dial-up
Internet connection:

Piano Public Domain: Ah, vous dirai-je Maman
http://pianopublicdomain.tripod.com/library/mozart/mozart_k265.pdf 

The file linked above is in .pdf format. You will need to have Adobe
Acrobat reader software installed on your computer in order to view
.pdf files. If you do not already have this software, a free download
is available here:
 
Adobe: Download Acrobat Reader
http://www.adobe.com/products/acrobat/readstep2.html 

Many thanks to my friend and colleague, scriptor-ga, whose assistance
with this research was beyond valuation.

Search strategy:

"mozart" + "manuscript(s)"
"mozart" + "12 variations"
"mozart" + "twelve variations"
"mozart" + "twinkle twinkle little star"
"mozart" + "ah vous dirai-je maman"
"classical" + "sheet music" + "public domain"

I hope this will meet your needs. If anything is unclear, please
request clarification; I'll be glad to offer further assistance before
you rate my answer. I have saved a copy of the .pdf file to my own
server in case the link does not function, and will provide a link
thereto if it is needed.

Best wishes,
pinkfreud

Many thank you's.  I didn't no it would be possible to download all l2
Variations.  Thank you for creating the link!