The Ruth Pitkanen Johnson series (1933-1989) contains artwork, both sketches and greeting cards, and creative writing. The series is completed by several newspaper clippings.

The Juliet Mattila series (1973-1992) primarily holds Mattila’s written work, both academic and poetry. It also includes Mattila’s transcripts, diplomas, and academic awards.

The Family Correspondence series (1932-1964) contains letters between Ruth Pitkanen Johnson, her mother, and her siblings. The series is completed by letters from Juliet Mattila to her parents while she was living in Vienna.