Container Gardening, by Antony Atha (hardback, 2002) -- $8.00
Incredible Plants, edited by Dr. Roger Carolin (hardback, 2005) -- $2.00
While a Tree Was Growing, by Jane Bosveld (hardback, 1997) -- $3.00
The Faithful Gardener, by Clarissa Pinkola Estes, Ph.D. (hardcover, 1996) --$1.00
Pennsylvania Certified Horticulture Program Study Manual and Reference Guide, by the PA Landscape & Nursery Association (softcover, 1999) -- $25.00 (NOTE: This is only available through the PLNA, at a cost of $50 for members, $75 for non-members.)