In California in the 1960鈥檚 Mayme Agnew Clayton, a career librarian, began collecting odd artefacts reflecting her African-American heritage.
Her hobby grew into a lifetime's work that soon became the largest independent collection of African American books, films, music, photographs and memorablilia.
After Mayme died in 2006, her son Avery Clayton took on the archive and began laboriously cataloguing the thousands of items.
Now the Mayme Clayton Library and Museum is opening its first exhibition in conjunction with the Huntington Library in Los Angeles.
Outlook reporter Dave King visited Avery Clayton and took a look at his mother鈥檚 collection.