Lawrence, George H.M. 1964. Catalogue of an Exhibition of Contemporary Botanical Art at the Hunt Botanical Library. Pittsburgh, Hunt Botanical Library, p. 17.
Copy by the artist of original of one of series of 31 color plates of hay-fever producing plants, published by Hollister-Stier Laboratories, Los Angeles, California, 1963.
Lawrence, George H.M. 1964. Catalogue of an Exhibition of Contemporary Botanical Art at the Hunt Botanical Library. Pittsburgh, Hunt Botanical Library, p. 18.
Copy by the artist of original of one of series of 31 color plates of hay-fever producing plants, published by Hollister-Stier Laboratories, Los Angeles, California, 1963.
Lawrence, George H.M. 1964. Catalogue of an Exhibition of Contemporary Botanical Art at the Hunt Botanical Library. Pittsburgh, Hunt Botanical Library, p. 18.
Lawrence, George H. M. (compiled by). 1968. 2nd International Exhibition of Botanical Art & Illustration. Pittsburgh, Hunt Institute for Botanical Documentation, p. 31.
Lawrence, George H. M. (compiled by). 1968. 2nd International Exhibition of Botanical Art & Illustration. Pittsburgh, Hunt Institute for Botanical Documentation, p. 31.
Lawrence, George H. M. (compiled by). 1968. 2nd International Exhibition of Botanical Art & Illustration. Pittsburgh, Hunt Institute for Botanical Documentation, p. 31.
Lawrence, George H. M. (compiled by). 1968. 2nd International Exhibition of Botanical Art & Illustration. Pittsburgh, Hunt Institute for Botanical Documentation, p. 31.
Secrist, Sally W. and N. Ann Howard (compiled by). 1977. 4th International Exhibition of Botanical Art & Illustration. Pittsburgh, Hunt Institute for Botanical Documentation, p.13.
Ten engravers translated the drawings into prints: Wolfgang Kilian (1581–1662), Servatius Raeven, Levin van Hulsen, Dominicus Custos (1560–1612), Robert Custos (1590–1651), Heinrich Ulrich (1570–1621), Friedrich van Hulsen (ca.1580–ca.1660), Johann Leypold, G. H. (possibly Georg Hortulanus) and Peter Isselburgh (1568–1630)
Ten engravers translated the drawings into prints: Wolfgang Kilian (1581–1662), Servatius Raeven, Levin van Hulsen, Dominicus Custos (1560–1612), Robert Custos (1590–1651), Heinrich Ulrich (1570–1621), Friedrich van Hulsen (ca.1580–ca.1660), Johann Leypold, G. H. (possibly Georg Hortulanus) and Peter Isselburgh (1568–1630)
Ten engravers translated the drawings into prints: Wolfgang Kilian (1581–1662), Servatius Raeven, Levin van Hulsen, Dominicus Custos (1560–1612), Robert Custos (1590–1651), Heinrich Ulrich (1570–1621), Friedrich van Hulsen (ca.1580–ca.1660), Johann Leypold, G. H. (possibly Georg Hortulanus) and Peter Isselburgh (1568–1630)
Ten engravers translated the drawings into prints: Wolfgang Kilian (1581–1662), Servatius Raeven, Levin van Hulsen, Dominicus Custos (1560–1612), Robert Custos (1590–1651), Heinrich Ulrich (1570–1621), Friedrich van Hulsen (ca.1580–ca.1660), Johann Leypold, G. H. (possibly Georg Hortulanus) and Peter Isselburgh (1568–1630)
Ten engravers translated the drawings into prints: Wolfgang Kilian (1581–1662), Servatius Raeven, Levin van Hulsen, Dominicus Custos (1560–1612), Robert Custos (1590–1651), Heinrich Ulrich (1570–1621), Friedrich van Hulsen (ca.1580–ca.1660), Johann Leypold, G. H. (possibly Georg Hortulanus) and Peter Isselburgh (1568–1630)