With Byrd at the South Pole was long available on VHS and DVD, but is now out of print.
It was a big box-office success in the early 1930s and in the late 1940s and early 1950s was a staple of films shown in schools. I saw it in the first or second grade at an event held in the school's auditorium in lieu of classes one Friday afternoon. It used to show up on the Late Show when the Late Show meant movies, not talk shows. It was filmed between 1928 and 1930. It deftly bridged the gap between silent films and talkies, starting out as a silent film with title cards and ending up with informative narration over the last fifteen minutes or so. It's quite riveting, and richly deserved its cinematography win.
“Life is a shipwreck, but we must not forget to sing in the lifeboats.” - Voltaire