- Soundings (1909)
- The Complete Book of Gardening (1909)
- Den komplette gartner (1910)
- Prinsippene for hagedesign (1911)
- Den lille steinhagen (1912)
- Rosehagen (1912)
- Vannhagen (1913)
- The Book of Garden Furniture (1914)
- The Book of the Flower Show (1914)
- The Book of Topiary (1914)
- The Making of a Garden (1915)
- The Beginner's Garden Book (1916)
- Den praktiske hageboken (1916)
- Grønnsakshagen (1917)
- Frukthagen og frukthagen (1917)
- The Book of Hardy Flowers (1918)
- The Book of Shrubs (1918)
- The Book of Trees (1918)
- The Book of Perennials (1919)
- The Book of Annuals (1919)
- The Book of Bulbs (1919)
- The Book of Water Plants (1919)
- The Book of Ferns (1919)
- The Book of Mosses (1919)
- The Book of Lichens (1919)
- The Book of Fungi (1919)
- Insektenes bok (1919)
- The Book of Birds (1919)
- The Book of Beasts (1919)
- The Book of Fishes (1919)
- The Book of Reptiles (1919)
- Amfibiens bok (1919)
- The Book of Geology (1919)
- The Book of Astronomy (1919)
- The Book of Physics (1919)
- The Book of Chemistry (1919)
- The Book of Biology (1919)
- Zoologiens bok (1919)
- The Book of Botany (1919)
- The Book of Anatomy (1919)
- The Book of Physiology (1919)
- The Book of Hygiene (1919)
- The Book of Medicine (1919)
- The Book of Surgery (1919)
- The Book of Nursing (1919)
- The Book of Dentistry (1919)
- Boken om veterinærmedisin (1919)
- The Book of Pharmacy (1919)
- The Book of Law (1919)
- The Book of Politics (1919)
- The Book of Economics (1919)
- The Book of Sociology (1919)
- The Book of Anthropology (1919)
- The Book of Psychology (1919)
- The Book of Philosophy (1919)
- The Book of Religion (1919)
- Bibelens bok (1919)
- The Book of Shakespeare (1919)
- The Book of English Literature (1919)
- The Book of American Literature (1919)
- Boken om fransk litteratur (1919)
- Boken om tysk litteratur (1919)
- Boken om italiensk litteratur (1919)
- Boken om spansk litteratur (1919)
- Boken om russisk litteratur (1919)
- Boken om kinesisk litteratur (1919)
- Boken om japansk litteratur (1919)
- The Book of Indian Literature (1919)
- Boken om persisk litteratur (1919)
- Boken om arabisk litteratur (1919)
- Boken om hebraisk litteratur (1919)
- Boken om gresk litteratur (1919)
- Boken om romersk litteratur (1919)
- Boken om antikkens historie (1919)
- Boken om middelalderhistorie (1919)
- The Book of Modern History (1919)
- The Book of American History (1919)
- The Book of European History (1919)
- Boken om asiatisk historie (1919)
- The Book of African History (1919)
- The Book of Australian History (1919)
- The Book of New Zealand History (1919)
- The Book of Canadian History (1919)
- The Book of South African History (1919)
- The Book of Indian
Noveller:
- "The Call of the Veldt" (1905)
- "De svakes styrke" (1906)
- "The Trail of the Tiger" (1907)
- "The Voice of the Desert" (1908)
- "Allahs hage" (1909)
- "Islams flamme" (1910)