Post-it note with handwritten message in blue marker. The message reads: "Thank you for being strong."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Ellis [last name redacted] We pray that you will feel better. 2nd Grade. 7 years." The note is accompanied by illustrations of flower pots, stars, a heart, a smiley face, and a stick figure walking in grass with a sun in the background.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a bird feather with geometric motifs. The back contains a handwritten note, which reads: "I'm sorry for your loss and I know what it like to lose someone dear to you but it is ok they will always love you no matter where you or the[y] are. -Owen H." The stock signature: "From your friends at West Allegheny Middle School," appears upside down on the upper right.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside reads: "All God's love to you and your families. Dave, Cindy, and Remy. God Bless." The church's contact information is included on the back of the envelope.

Card made by a student from the George Washington University Hillel. The front cover contains a bilingual Hebrew and English message: "Haverim (friends) in Pittsburgh" with a Star of David below. The inside (from right to left) reads: "Sending love, solidarity, and hope. Our community is the strongest in the world! -Sam, GWU student, Colorado Springs, CO, Temple Beth Torah."

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside is dated October 28, 2018 and reads: "Dear Friends, Peace to you. May you live in the love, joy, and kindness of the God of Abraham, Isaac, and Jacob. God is on the throne, always. Harry [last name redacted]." The church's contact information is included on the back of the envelope.

Square card with white and yellow text against blue background. Card reads, "Mitzvah4Pittsburgh. Some spread darkness. We spread light. Choose a good deed. Choose a Mitzvah. Add light to the world," followed by four options and a place for respondents to list their name and email address. Some names and email addresses have been redacted for privacy.

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of a haloed dove flying in front of Noah's ark. Signed "Jack [last name redacted] 5th grade." The inside reads: "God Loves You. We will remember you. Jack Grade 5."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration a heart with geometric and floral motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Prejudice is the child of ignorance- Sister Corita Kent. We who are enlightened through Christ Jesus stand with you. -Dean [last name redacted]."

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside contains messages of peace, love, and unity. The church's contact information is included on the back of the envelope.

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of seven children holding hands around a table with a large goblet and loaf of braided bread, and seven doves. The illustration is labeled: "We are people of God's peace." The inside reads: "Tree of Life Synagogue, We pray for you. May you have a good recovery and keep close to God. -Elizabeth, Holy Angels CCD."

Handwritten note written in black ink on blue paper. The note, which contains dozens of small, illustrated hearts around a large heart in the upper center, reads: "Lots of Love."

Handwritten sign in marker on paper with blue and white zig zag pattern reading: "Love is strong, Hate is wrong." A heart appears in the lower right corner; various illustrations throughout.

Oral history with Josiah Gilliam recorded as part of the Meanings of October 27th oral history project.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside contains messages of love, unity, and blessings. The church's contact information is included on the back of the envelope.

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of a haloed dove flying in front of Noah's ark. The inside reads: "Dear Tree of Life members, I am keeping you and all of the others affected by this tragedy. My deepest sympathy, Molly [last name redacted] Holy Angels CCD."

Typed memorial note in honor of Joyce Fienberg. The author recalls personal details about Joyce's research career at the University of Pittsburgh and her caring personality.

Post-it note with handwritten message in black marker. The message reads: "We wish you peace and love from NY. The Brodys."