In 1893 Dr. William H. Egle edited for publication as Volume XIX of the Second Series of the Pennsylvania Archives the Minutes of the Board of Property beginning with Book C, the earliest extant volume of the Minutes which was legible. It begins with the session of 13 3rd month 1687 and ends with the session of 30 3rd month 1732, naming thousands of persons--tenants and owners--associated with various land holdings. The proceedings of the Board of Property affected a considerable number of early Pennsylvania settlers; collected in book form, the Minutes of the Board constitute a formidable body of land records and must be considered one of the most valuable compilations in Pennsylvania genealogy as a whole. In reference to the way the books are indexed with letter (A, B, C etc) which Sharon just recently pointed out, the earliest are not available. Even in 1893 the author was unable read or find book A & B. The book is available here http://www.genealogical.com/item_detail.asp?ID=7512 on a CD with another 10 books of old PA information for $19.95 +. It may be a worth while purchase for PA history researchers. The book was reprinted in recent years by a commercial company and may be available under ISBN # 0806307234 or maybe eBay.