Companion Plants and How to Use ThemHelen Philbrick, Richard B. Gregg, Herbert H. Koepf · First published 1967 · Latest edition 2016Open the Tome
Journeys With a Real Jack in the PulpitHelen Louise Porter Philbrick · First published 2005Open the Tome
Gardening for Health and NutritionJohn Philbrick, Helen Louise Porter Philbrick · First published 1995Open the Tome
COMPANION PLANTS & HOW TO USE THEM. Sponsored by the Bio-Dynamic Farming & Gardening Association.Helen & Richard B. Gregg. Introduction: H.H. Koepf Philbrick · First published 1966Open the Tome
