Also: volume measurements with non-dense dry items like seeds and grains are inherently ... iffy. Or prone to a good amount of variation. You'll get more consistency with a weight measure in ounces or grams.
But as mentioned, the USDA or similar is good place to start. Their information gets incorporated into the SelfNutritionDate site, for example (nutritiondata.self.com/facts/nut-and-seed-
) ... I enjoy the graphs/charts.