As an extension of my research, there are 1,022 photos of identified caterpillars on a www.Flickr.com website, which can be accessed by searching "Caterpillars of the Allegheny National Forest".  Or link to site here.
Many of our photos have also been submitted to www.bugguide.net  and are integrated into their regular taxonomic database.  Below are just 12 of these photos.
These caterpillars (and leaf-feeding hymenoptera, sawflies) were identified by distinctive field marks or DNA barcoding.
A former student Arpad Hervanek did excellent quality work on this project.

Lepidoptera, Noctuidae, Noctuinae, Morrisonia confusa. Confused Woodgrain. Hostplant is Yellow or Sweet Birch.

Lepidoptera, Erebidae, Lymantriinae, Orgyia leucostigma. White-Marked Tussock Moth. Hostplant is Black Cherry.

Lepidoptera, Noctuidae, Noctuinae, Morrisonia confusa. Confused Woodgrain. Hostplant is Red Maple.

Lepidoptera, Saturniidae, Ceratocampinae, Dryocampa rubicunda. Rosy Maple Moth. Hostplant is Red Maple.

Lepidoptera, Geometridae, Ennominae, Melanolophia signataria/canadensis. Melanolophia. Hostplant is Pin Cherry.

Lepidoptera, Notodontidae, Heterocampinae, Heterocampa guttivitta. Saddled Prominent. Hostplant is Yellow or Sweet Birch.

Lepidoptera, Tortricidae, Tortricinae, Acleris nivisellana. Snowy-Shouldered Acleris. Hostplant is Pin Cherry.

Lepidoptera, Geometridae, Ennominae, Melanolophia signataria/canadensis. Melanolophia. Hostplant is Black Cherry.

Lepidoptera, Tortricidae, Olethreutinae, Ancylis divisana. Two-Toned Ancylis Moth. Hostplant is American Beech.

Lepidoptera, Tortricidae, Tortricinae, Pandemis lamprosana. Woodgrain Leafroller. Hostplant is American Beech.

Lepidoptera, Tortricidae, Tortricinae, Choristoneura rosaceana. Oblique-Banded Leafroller Moth. Hostplant is Red Maple.

Lepidoptera, Tortricidae, Tortricinae, Choristoneura rosaceana. Oblique-Banded Leafroller Moth. Hostplant is American Beech.