Block Books are available at the Archives and the Mitchell Courthouse in Baltimore. To use the Block Books the block number is needed. As long as an address is known, the city block maps can be used to determine the block number. City directories can be used to determine an address, at least of where a person was living at a specific time. Since many street numbers were changed between 1851 and 1896, the names of cross streets may be necessary to locate the correct block number.
Some city directories give cross streets.
The second type of index to land records provides references based on the names of the parties involved in the transaction. Grantor and grantee indexes list the respective parties alphabetically on a year by year basis. Entries give the address, book reference, and page number. These indexes, having never been microfilmed, exist only at the Mitchell Courthouse. 1966-1982 Saffady, William, Micrographic Systems , 3rd ed.