The Polish Pioneers in Virginiaby Sigmund H. Uminski
This is a "must read" book for anyone doing serious research into the Jamestown Poles.
Uminski, Sigmund H. The Polish Pioneers in Virginia, The Polish Publication Society of America, New York, 1974.
Uminski wrote a great summary book which gathers all the existing theories (with critique of some of the methods used) and his own original research about the Jamestown Poles. There is a lengthy discussion of the probability whether the "Merchant's Memoir" actually exists, and what is actually known about the Jamestown Polish settlers from sources outside this mysterious missing book.
About Sigmund H. Uminski
The Polish Pioneers in Virginia by Sigmund H. Uminski (parts available via Google Books)