Is "which [noun] ..." correct? [duplicate]
It's common in American lawyer-mangled English. It is certainly common in legal documents. There are much clearer ways to write it (perhaps "...form duly completed. This form shall include...")
Lawyers always try to remove ambiguities (which, they fear, could be interpreted to the detriment of their clients), even if that makes for very awkward language.
If you read old[er] literature it often appears in sundry texts, which texts comprise novels, essays, letters, &c. ;)