1.
Taxonomic Studies in the Phacelia Magellanica Polypoid Complex : With Special Reference to t...
by Heckard, Lawrence R.
ISBN: 9780598200921
List Price: $40.30
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Systematics and Evolution of Cordylanthus
by Chuang, Tsan I., Heckard, L...
ISBN: 9780912861104
List Price: $14.00