There is a book called "Haas Family History", published in Fogelsville, Lehigh County, Pa., in 1982 by Arthur Milton Haas.
The following site giving descendants of John Peter Haas starts at
http://familytreemaker.genealogy.com/users/d/e/h/Jeffrey-L-D...and ends at
http://familytreemaker.genealogy.com/users/d/e/h/Jeffrey-L-D...where the page numbers run from 1 thru 14. The last page gives references, many referring to this book.
