Post-it note with handwritten message in black marker. The message reads: "We love you!" An illustrated heart appears in the upper right corner.

Hand painted card with a rainbow-colored heart on the front. Signed lower right: "Love, Brian S." The card has been laminated.

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

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.

Brown envelope with handwritten note in black ink on a rectangular emblem, reading: "In Memory." Staining and creasing due to exposure to the elements at the Wilkins memorial.

Handmade card in watercolor on paper. The card features a hand painted illustration of various flowers , including red tulips, growing from the earth against a blue sky. The card reads in the upper center: "Stronger than hate."

Floral tag addressed to David Rosenthal. The tag features a white rose on the left and the stock message: "With Deepest Sympathy" in a band on the upper center.

Floral tag from floral arrangement addressed to the Mallingers, sent by Andrea. Andrea identifies herself as an old neighbor of the Mallinger family. The note is handwritten in black ink on a white paper.

Pamphlet for the Christian organization, "Guardians of Freedom."

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: "Pray for world peace. Praying for all. Love Wins!" The church's contact information is included on the back of the envelope.

Floral tag from floral arrangement sent by Michelle. The tag reads: "Shalom! Love, Michelle." The message is written in black marker on a printed tag with a green background and floral motifs.

Spiral bound booklet with peach-colored cover page, gray binding, and light blue back cover, 43 pages. Contains information for members, including descriptions of officer responsibilities, a guide for leading services, and contact information for Jewish resources in Pittsburgh. Two pages containing contact information have been redacted from digital version.

Note from a member of The Church at Severn Run in Severn, Maryland. The note reads: "God bless you all and your synagogues in this difficult times and may the spirit of the Lord watch over you. [Signature illegible]."

Post-it note with handwritten message in blue marker. The message reads: "We will not be bystanders. We will take action. All of us have a role to play. Everyone can help."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "To The Dear Tree of Life Community, I am so, so sorry for the loved ones you have lost in the most unthinkable of ways. Your brothers and sisters in San Diego, at Point Loma Community Presbyterian mourn with you. We pray that you will find a peace that goes beyond human understanding. Know that I am committed to doing- as much as any one person can do to build bridges of love, compassion, and shalom, and that I will always remember your family of faith while doing so.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear friends, My heart and prayers are with all of you as you process your loss and the events in these past few days. May God's presence and comfort be showered on every one of you. I cannot even begin to imagine... I pray for God's grace and blessings. With love, Cheryl [last name redacted]."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Tree of Life, I bleed for you and with you. My soul hurts for you. I stand with you in your faith. I pray for healing. Lola. Point Loma Community Presbyterian Church."

Post-it note with handwritten message in blue marker. The message reads: "I pray to you and remember you always. May your soul rest in peace." Tape affixed on the upper center.

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front cover features the following quote: "No act of kindness no matter how small is ever wasted." An illustration of a rainbow appears below. The inside reads: "Dear Tree of Life Congregation, I am sorry for your loss. I am writing to you from Colorado. I would like you to know people far away care for you. I may not believe in Judaism but I believe your heart is in the right place. Sincerely, Uyen [last name redacted], Littleton, Colorado."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Deliver us from evil! -"