This collection is comprised mostly of correspondence. The first series consists of Josiah L. Parrish's correspondence, documents, and records. These records and letters cover several topics, including biographical and family information, information regarding business affairs and history. The biographical information deals with Josiah L. Parrish's family. There is limited information regarding his children from his first wife, Elizabeth Winn Parrish, his second wife Jennie Litchenthaler Parrish, and their daughters (Josie and Grace), and his third wife Mattie A. Pierce and her son LaRonda Pierce.

Parrish, being important in the history of Oregon, has a great deal of historical information in his collection. Also included in the history section is a copy of the general instructions to missionaries. Included in the business affairs materials are correspondences and records related to prospecting, agriculture, and real estate, as well as personal business records. Parrish's papers also include three oversized documents - one making him a member of the New York State Militia, one making him an Indian Agent, and one signed by President Andrew Johnson granting him land in Oregon.

The second series contains Mattie A. Parrish's papers, mostly letters. The biographical and family information contains correspondence between Mattie and her relatives - including her husband and his children, as well as her own child LaRonda.

The business affairs material is divided into financial records, legal records, and solicitations. The financial records cover banking, loans, notes, groceries, dry goods, livestock, clothiers, hardware, insurance, furniture, appliances and lumber.

The legal documents consist of letters from lawyers, court cases, and deeds. The collection also contains several clippings. These clippings cover multiple women's rights, socialism, the history of Oregon and its first Methodist pioneers, articles on Oregon and its politics, obituaries of relatives and neighbors, birthday announcements, Arbor Day, editorials, Helen Keller and the blind, and labor disputes.

This collection is made up of records from the various educational institutions that were run or supported by the Board and administrative material from the Board of Christian Education and its predecessor organizations.

This collection is made up of material related to the division of the Church of the United Brethren in Christ in 1889 and the property disputes related to the division.

This collection primarily documents the work and ministry of the Evangelical Church's annual conferences and local churches from the middle nineteenth century to the middle twentieth century. To a lesser degree there are records that reflect the ministry of the general church as well. There are other records that pertain to filial denominations such as the Evangelical Association, United Evangelical Church, Church of the United Brethren in Christ (United Brethren Church), and the Evangelical United Brethren Churches are also found in this collection. Leedy was an avid collector of church related information so that the topical landscape of this collection is broad enough to cover information ranging from local church ministries and histories to denominational theological beliefs and social concerns. Most of the paper records center on church work in the Ohio region though not to the exclusion of other geographic areas within the continental United States and Germany. All in all this collection provides a nice overview of the diversified life within the Evangelical tradition and is an excellent resource for those who wish to understand more fully the Evangelical Church's historical influence within the ongoing traditions of United Methodism.