Craig's List of helpful links
Bee Anatomy
A Beginner's Filed Guide to Identifying Bees
An annotated checklist of the bees (Hymenoptera: Anthophila) of San Diego County, California
Exotic Bee ID
Bees! Diversity, Evolution, Conservation
Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region
Field/Photo ID for Flies
Exporting Observations from iNat
Pollen Specialist Bees of the Western United States - Jarrod Fowler 2020
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If you are in Costa Rica, let me recommend this guide. It's in PDF and free to download (and in printed version as well)
https://libreriaucr.fundacionucr.ac.cr/index.php?route=product/product&product_id=1927
@fede2cr thanks!!
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