David Rogers' extraordinary biological drawings of the flora in the Tassajara Area. This is book two. Book one has supportive data. This two volume set, published this year, now replaces the single volume version he published in 1998.
PDF of A Flora of Tassajara, Vol. 2 (link for PDF of volume one and David's Tassajara History Scrapbook at David Rogers Cuke page
I think David's flora and Tassajara history books might be available through the SFZC Bookstore and Giftshop.