BBC Archives
From Tardis Wiki, the free Doctor Who reference
The BBC Archives are a collection of materials about and from the history of the British Broadcasting Corporation.
Not all the episodes of the First and/or Second Doctor eras were preserved in the BBC Archives, as many were junked during the 1970s as being of no further marketable value — for example, only episode two of Season 5's six-part story The Abominable Snowmen exists there.
Fortunately, over the years, many previously missing 1960s black and white Doctor Who episodes have been found and returned to the BBC Archives by private film collectors or overseas television stations.
