Hope this helps someone,
Marriage New York 1600s-1800s
This link came through the Roots-l mail list-
http://freepages.genealogy.rootsweb.com/~blkyn/Marriage/Marr.index.html
Caswell, Agnes Spouse : ???, ???
Marriage date : 1888
Location : Manhattan
* Certificate Number : 7845
Caswell, Allen Spouse : Edwards, Kate
Marriage date : 1874
Location : Manhattan
* Certificate Number : 531
Caswell, Cassius C. Spouse : Brawing, Susan E.
Marriage date : 1872
Location : Manhattan
* Certificate Number : 3320
Caswell, Henrietta Spouse : Smith, Charles S.
Marriage date : 1869
Location : Manhattan
* Certificate Number : 3028
Caswell, John Spouse : Crawford, Jane
Marriage date : 1808
Location : New York City
1911, **** selected extracts
Page : 325
Caswell, John Spouse : Curtip, Mary
Marriage date : 1872
Location : Manhattan
* Certificate Number : 7696
Caswell, Mary Spouse : ???, ???
Marriage date : 1869
Location : Manhattan
* Certificate Number : 4459
Caswell, Philip Spouse : Clarke, Sarah
Marriage date : 1760
Location : New York City
1938, **** selected extracts
Page : 377
Caswell, Susan M. Spouse : Bagley, Jefferson
Marriage date : 1841
Location : Buffalo and vicinity
County : Erie
Vol.2, No.12 (Jun 1936)
Good Luck,
Kathy Caswell Rinke