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- Significant Dates in U.S. Food and Drug Law History - Food and Drug Administration (FDA). United States Department of Health and Human Services.
- Purchasing Power Calculator - Purchasing power of money in the U.S. from 1774 to present. The calculator compares the relative value of a past amount of dollars to a present amount using various prices, wages, output, etc., depending on the context. MeasuringWorth.com
- Visual Arts and Agricultural History - National Agricultural Library. United States Department of Agriculture (USDA).
- Historic Food Prices Timeline - FoodTimeline Library.
- Organic Farming History - United States Department of Agriculture (USDA).
- ARS Timeline - 144 years of the history of agriculture research at the U.S. Department of Agriculture and Agricultural Research Service.