Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a heart with floral and geometric motifs. A handwritten note and signature appear in the upper and lower right corners respectively. The back features the stock signature: "From your friends at West Allegheny Middle School."

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: "My thoughts are with you. We must erase hate. I love you. B.R." 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: "Dear Tree of Life Members, We are all praying for you and your losses. Please join in our prayers for the police officers injured. From Holy Angels CCD."

Post-it note with handwritten message in black and red marker. The message reads: "God bless all people of Pittsburgh. Our hearts are with you. [Heart]."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Brothers and Sisters LOVE conquers all!!!"

Red synthetic flowers with green leaves inserted into a cylindrical piece of synthetic moss. Wrapped in brown textured paper and tied with raffia bow.

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 message of love, prayer, and solidarity. The church's contact information is included on the back of the envelope.

Folded card on light green paper. Two circular stamped imprints visible in the center of both the right and left flaps. Pink and darker green staining throughout. Due to exposure to the elements at the Wilkins memorial, the message on this card is no longer visible.

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

Post-it note with handwritten message in black marker. The message reads: "We will make the world a better place in the name of your memory."

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front cover contains the following quote attributed to Hubert H. Humphrey: "The greatest gift of life is friendship and I have received it. Quote is accompanied by Star of David and a heart. Signed: "By Jace S." The inside reads: "Dear Rabbi Jeffrey Myers, I am a student from Colorado and I heard about the news and I am sorry for your loss. Sincerely, Jace [last name redacted], Goddard Middle School." Back reads: "Friends never say goodbye."

Card made by a student from the George Washington University Hillel. The front cover contains an illustrated heart. The inside reads: "We stand with you. You are in our thoughts and prayers. With love, Leah and Molly from GW."

Program from the November 4, 2018 Sunday worship at Blessed Sacrament Cathedral in Greensburg, Pa. The program contains a special prayer, titled "A Prayer for our Neighbors," which offers words of support for all the victims of the October 27 attack. Signed by two parishioners, Ed and Camille [last name redacted] on the center left.

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 affirms the sender's belief in God. The church's contact information is included on the back of the envelope.

Post-it note with handwritten message in black marker. The note features a quote from Psalm 116:15, reading: "Precious (costly) in the sight of the Lord is the death of his saints."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated 11/4/18 and reads: "Tree of Life Community- All of your brothers and sisters at Point Loma Community Presbyterian Church mourn with you. We are absolutely devastated at the events of last week's service, and there are no words one can say to make sense of it. The God of Abraham, Isaac, David, and Jacob is with you, and we pray for comfort, community, city, our country and our world.

White synthetic tree with 11 pieces of black lace tied to branches and a rosary tied to top branch. Square base of tree has switch for battery operated power. Attached to front of tree is a greeting card with message from sender.

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: "The Tree of Life Members, even though you are going through something tough you will get through it by praying and being with each other. Sincerely, Holy Angels CCD."

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.