Mule deer (Odocoileus hemionus hemionus), Columbia blacktail (Odocoileus hemionus columbianus), and Sitka blacktail deer (Odocoileus hemionus sitkensis) are subspecies of the same species that are separated by geographically defined boundary (Chapter 2) lines for records-keeping purposes.
Scorechart – Typical Mule Deer and Blacktails
B&C WORLD RECORD TYPICAL MULE DEER
Records of North American Mule Deer by Boone and Crockett Club - Issuu
Measuring and Scoring Mule and Blacktail Deer - B&C Club Official Guide
PacWest Outdoors: The 9 Habits of the Record Book Buck Hunter
blacktail buck
Measuring and Scoring Mule and Blacktail Deer - B&C Club Official Guide
First buck, how do I score him? : r/Hunting
Measuring and Scoring Mule and Blacktail Deer - B&C Club Official Guide
Measuring and Scoring Mule and Blacktail Deer - B&C Club Official Guide
Climb High For Sitka Buck Hunting - Bowhunter
Pro Insight Archives - Page 2 of 4 - Journal of Mountain Hunting
Measuring and Scoring Mule and Blacktail Deer - B&C Club Official Guide
BBS Official Measurers — Bucks-Bears-Stags