The Canadian Centre for Architecture has just wrapped up posting the series A305, aka "History of Architecture and Design 1890-1939," on its YouTube channel. The 24 programs created by the Open University originally aired on BBC2 between 1975 and 1982. The CCA uploaded them as part of its exhibition, The University Is Now on Air: Broadcasting Modern Architecture, which was on display until the beginning of April.
Head to my A305 post from January to watch all 24 episodes.

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