]> GH barcode-01799649 United States of America Oklahoma Head of Canyon, 7.9 mi. south of Interstate 40 at turnoff between the two US 281 turnoffs, and 0.7 mi. south on Methodist Canyon Camp Road, southeast of Hinton. Triodanis holzingeri McVaugh McVaugh 2019-05-21 20:35:16 T. R. Bradley