Range and Forage Resources - A collection of reference information published by Nebraska Cooperative Extension at the University of Nebraska.

Penn State's Forages - Information and links on forage management, notes on related soil and botanic science.

European Central Crops Database for Lolium and Trifolium repens - Accession and passport data for all records held in 30 countries participating in the scheme.

Perennial Ryegrass - A compendium of technical information on the use of ryegrass for pasture.