The subject heading in the online catalog for genealogy, especially as a subheading under the names of places (i.e, 'Bedfordshire (England) -- Genealogy') can be helpful in locating many useful works. A few sources are noted here.

Harleian Society, London. Publications. London: 1869-
Perkins/Bostock Stacks CS410 .H3; vols. 44-49 in Perkins Reference 
Many volumes in this extensive series contain family genealogies compiled during visitations made in the counties and other localities during the 16th and 17th centuries. Other volumes include marriage, baptismal, and burial records, grantees of arms, etc., some of them as late as the 19th century. The visitations are an enormous body of genealogical information. Consult the author-title entry under the Harleian Society for a list of all volumes or the subject entries under specific counties or localities. Volumes 44-49 contain Sir William Musgrave's Obituary Prior to 1800, an especially valuable work that is an alphabetical index to obituaries and biographies found in some 85 sources. Names, dates, identifying phrases, and citations of the sources of the data are provided. The list of abbreviations for works cited is itself a bibliography of biographical sources.

The Harleian Society has also published many parish registers that are available here. Another sizeable body of parish registers was edited by William Phillimore Watts Phillimore.

Howard, Joseph Jackson. Visitation of England and Wales. Edited by Joseph Jackson Howard, LL.D., Maltravers Herald Extraordinary... and Frederick Arthur Crisp. London: Priv. print., 1893-1921. 21 vols.
Perkins/Bostock Stacks 929.72 H849V
These family genealogies are additionally valuable, because biographical data is supplied for each member of the family when available. Each volume has a list of pedigrees as a table of contents and also an index and additions and corrections at the end. Facsimiles of autograph signatures are common.

Burke, Sir John Bernard. A Visitation of the Seats and Arms of the Noblemen and Gentlemen of Great Britain. London: Colburn and Co. 1852-1853. 2 vols.
Special Collections Library, E #18840
A major part of this work is a history of residences, including the identities of their various owners. Another section is the visitation of arms, or family genealogies. Both parts are indexed. The edition of 1854-1855 also includes Ireland. It is assumed that researchers will consult the various editions of the Peerage and the Landed Gentry by Burke (see Basic Sources).