Can I use the information extracted from the Livingston County, New York, Index, Grantors, A and B, 1821-1920, in conjunction with New York, Land Records, 1630-1975 Livingston at FamilySearch? The answer is a resounding YES!
The first bit of information extracted (from microfilm that I had ordered at a FHC): Acker, Silas to David McClennan, Groveland, in the year 1831, Liber/Page 9-250
So far, so good; Liber 9 is online:
The deed was found on Page 250 (Image 462) and Image 463
Another "Acker" deed can be found at Liber/Page 9-85, involving Francis and Permelia Acker (Image 378).