A really useful resource for learning PDP-11

I found a really useful series of videos on youtube and I want to include links to them here for anyone who is interested. As far as I can tell they are a series of videos from 1977 produced as a training program by DEC for people who would be operating a PDP-11. I have listed the videos in order here:

1. Tape 01 - System Overview

2. Tape 02 - Unibus Concepts part A

3. Tape 03 - Unibus Concepts part B

4. Tape 04 - Priority Control

5. Tape 05 - Processor Organization part A

6. Tape 06 - Processor Organization part B

7. Tape 07 - Address and Memory Organization part A

8. Tape 08 - Address and Memory Organization part B

9. Tape 09 - Use of the Console

10. Tape 10 - Addressing Modes part A

11. Tape 11 - Addressing Modes part B

12. Tape 12 - Addressing Modes part C

13. Tape 13 - Instruction Set part A

14. Tape 14 - Instruction Set part B

15. Tape 15 - Instruction Set part C

16. Tape 16 - Instruction Set part D

17. Tape 17 - Instruction Set part E

18. Tape 18 - Instruction Set part F

19. Tape 19 - Instruction Set part G

20. Tape 20 - Instruction Set part H

21. Tape 21 - IO Programming part A

22. Tape 22 - IO Programming part B

23. Tape 23 - IO Programming part C

24. Tape 24 - IO Programming part D

25. Tape 25 - PDP-11 Family part A

26. Tape 26 - PDP-11 Family part B

27. Tape 27 - PDP-11 Family part C

28. Tape 28 - PDP-11 Family part D

There is a ton of useful information in these videos. Each video is between 15 and 30 minutes, so there's quite a lot of material, but it's worth the effort.