The American Baptist Historical Society Manuscript Collection list can be found at http://www.abhsarchives.org/docs/Colgate_Manuscripts.pdf. This manuscript collection is housed at the America Baptist Samuel Colgate Historical Library in Rochester, New York. This is a great list that includes journals, correspondence, newspaper clippings, student notes, photographic albums and more.
There is some great vital record information in this manuscript collection including marriage records, deeds, and even some patient records from a physician. Here are some examples I found in the manuscript collection list.
E. R. Clemens (?-1914).
Marriage Licenses 1904-1938. 67 items
John Harvard Castle (1830-1890)
1volume notebook containing a record of marriages performed in Pottsville, PA 1853-1856, Newburgh, NY, 1856-1859, Philadelphia, PA 1859-1873.
Mary Ann Stotesbury Crozer (1836-1918)
Published copy of Mary's will, 1918; photocopies of obituaries, and of newspaper articles about persons contesting the will, 1918-1920
William Edwin Darrow (1864-1939 )
record of marriages performed by Darrow, 1909
Ely, Edward T. Ely, Physician 3 items
Three casebooks of a medical doctor with patient histories, diagnoses, etc., 1878-1882.
Thomas Garder Field (1843-1926)
Book of Baptism Records 1874-1886.
Jonathan Goble (1827-1896)
Scrapbook compiled by Montgomery with information about the First Baptist Church of Coffeyville, Kansas; original poems; biographical/genealogical information about her family, particularly her father, William Anderson Kern.
Joel Henry Greene (1806-1873)
Marriage register, 1831-1867.
Howard Benjamin Grose (1851-1939)
Family papers, including genealogical information; diary and correspondence, 1840-1860
Horatio Gates Jones (1777-1853)
Register of marriages, 1802-1852.
Morgan Jones 1764
Will and Deed.
Samuel Denton Merrick (1815-1910)
Volume of autobiographical notes, 1896; family record of births, deaths, and marriages.
Charles Morton (1798-1874)
Record of marriages performed, 1830-1866
William Richard Patton (1835-1899)
Marriage register 1885-1899.
Roger K Powell. (1914-)
Record of weddings, funerals, and baptisms performed by Powell, 1938-1956.
Timothy Remick (1775-1850)
Certificates of intentions of marriage, 1805-1842
William Shadrach (1804-1890)
Marriage and baptism register
William Henry Spencer (1838-1926)
Marriage records (3 volumes), 1892-1904
Levi B. Steele (1829-1907)
Record of marriages, 1864-1868
Joseph Wanton Taggart (1805-1893)
Marriage register; diaries, 1846-1859