ID Guides
I thought I'd start a collection of identification guides others have pointed me toward.
Moved into a wiki format here: https://forum.inaturalist.org/t/observing-identifying-wildlife-wiki/
FLIES
https://sites.google.com/view/flyguide
CATERPILLARS
https://www.fs.fed.us/foresthealth/technology/pdfs/Caterpillars_of_Eastern_Forests.pdf
CLEARWINGS (Hemaris)
http://www.silkmoths.bizland.com/Sphinx/bshthysbe.htm
http://mothphotographersgroup.msstate.edu/species.php?hodges=7854
GRASSES
https://forum.inaturalist.org/t/how-to-identify-grasses/8538/3
TREE OF HEAVEN v WALNUT v SUMAC
(vid) https://www.youtube.com/watch?v=4BA5Dec3_8o
HICKORIES
http://bioimages.vanderbilt.edu/pages/compare-hickories.htm
ASHES
http://www.treeremoval.com/ash-tree-identification-guide/#.XYLP0ChKg-V
FUNGI
(vid) https://www.youtube.com/watch?v=LKF_pIY0Zpc
MICROORGANISMS
https://diatoms.org/genera/pinnularia
https://www.biodiversitylibrary.org/item/23616#page/7/mode/1up
not available online, but useful for ID of genera https://books.google.ru/books/about/Freshwater_Algae_of_North_America.html?id=yjnLAwAAQBAJ&redir_esc=y