Dwarf conifers

The silva of North America

Sargent, Charles Sprague

1891

Conifer pests in New Mexico

Robert Cain

1990

Catalogue of Canadian plants

John Macoun

1883

News letter

Manning Seed Company

1950

Handbuch der Nadelholzkunde

Ludwig Beissner

1891

Dwarf and slow-growing conifers

Murray Hornibrook

1923

Cone-bearing trees of the Pacific coast

Nathan A. Bowers

1942

Encyclopaedia Coniferae

John Silba

1986