Grey literature databases identify resources that are key to research and scholarship. Many are open resources that go through a quality control process before they are published.
Definitions are scholarly dictionaries, encyclopedias and handbooks that help define terms and provide additional context. There are a variety of key enology, viticulture, grape, wine, food and drink encyclopedias, handbooks and companions. A select list includes,
FooDB (food constituents, chemistry and biology database)
Diner's Dictionary: Word Origins of Food & Drink (2012)
Oxford Companion to Wine (2015)
Glossary (Wine Spectator)
Handbook of Enology (2 volumes, 2021)
Oddins Dictionary of Wine (2004)
Wine Encyclopedia (Wines.com wiki)
Patents, standards and trademarks are intellectual property resources of potential interest.
Occupational Health and Safety information is essential to dealing with injuries, accidents, government and regulatory information.
Theses and Dissertations are important unpublished resources granted and retained by universities as capstone projects, these, and dissertations.