The BBC documentary about the around-the-world trip of the Graf Zeppelin in 1929 includes the Los Angeles visit:
https://www.youtube.com/watch?v=d4jq7oRxw-g
A bit overlong, some repetitive (and occasionally incorrect) stock footage, and a somewhat cloying emphasis on the lady journalist whose diaries were used as a basis, but many fascinating shots, especially for viewers unfamiliar with those amazing beasts.
Cheers,
Earl