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. The back contains a handwritten note, as well as the partial 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: "Stay strong, remain faithful, know you're loved. - Scott." The church's contact information is included on the back of the envelope.

Hallmark card from a member of St. Peter's Episcopal Church in Londonderry, New Hampshire. The front cover features a large rose and reads: "Give thanks to the Lord, for he is good. His love endures forever. Psalm 136:1 (NIV)." The inside reads: "Blessings and prayers to aid you in healing and the love of God to embrace you and ease the pain. Sally [last name redacted]."

Handmade sign illustrated with colored pencil. The sign reads, "Love is Stronger Than Hate," written in blocky bubble letters. An additional message, reading: "We will not forget you," written in an italicized script, appears on top of the bubble letters. Lightly shaded in the background.

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

Floral tag from floral arrangement sent by Daniel Mulhall, the Irish ambassador to the United States, on behalf of the people of Ireland. The note is printed on a tag with a beige background from a local florist.

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."

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. It is signed: "[S]ean [last name redacted] Holy Angels CCD Grade 5." Due to water exposure at the memorial site, the message in this card has been partially erased. The remaining text inside reads: "[D]ear Tree of Life Members, I am very sorry of what happened... that peace is comforting everyone...tragedy in synagogue. P.S. Peace be with you.

Magazine cutting with sparrow sitting on a tree branch on the front cover with the stock quote "dreamy, melancholic variations." Printed poem below and above the quote. Tear marks on the upper edge. Image of three women in long peasant skirts standing on a wooden floor around an illuminated candle.

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: "Everyone will stand with you through these tough times. -Flynn."

Card made by a student from the George Washington University Hillel. Card reads: "My thoughts and prayers are with your community. Stay strong, because the entire world is with you. - George [last name redacted]."

Folded card on light blue paper. Extensive creasing and blue and yellow staining. Due to exposure to the elements at the Wilkins memorial, the message on this card is no longer visible.

Floral tag from floral arrangement, which reads: "With Love from our Family to Yours [heart]." The note is written in black marker on rectangular piece of wrapping paper with brown and red stripes.

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.

White poster with inscription in black, blue, red, and green marker. Back blank.

Card with illustrated sunflower. Inscribed in ink with the following message: "Hate cannot break our Steel City." Signed: "equal [=] love [heart] Star of David."

Piece of notepad paper with a pencil drawing of a flying angel with wings and a halo.

Floral tag from floral arrangement sent by L.F., which reads: "To my Hebrew family- I'm so sorry for your loss. There are no words. But the strength that you have shown is what we need. Stay strong. We are all here with you. L.F. [heart]." The message is written in black ink on a printed tag; a Star of David appears in the upper left corner.

Printed note in black ink on white paper. The note reads, in capital letters: "Your Christian brothers and sisters are praying with you." Tearing and creasing due to exposure to the elements at the Wilkins memorial.