One that is maybe little known is the NFB site. Their record in actually producing historical narratives is mixed. Preference for drama over fact. Heavy ideology.
But. I love their 1950s docs about different elements of the Canadian economy.
Like this one
www.nfb.ca/film/wheat-c...
Here is a film showing how each spring, prairie farmers renew their gamble with wind, frost, drought, rust and hail to begin again the cycle that may bring …