Flyer with "Stronger Together" in blue and red handwritten font against photograph of the skyline of Pittsburgh with a tree imposed against the clouds. Includes information about event and the names of featured performers, as well as various logos. A small note reads: "In memory of our holy brothers and sisters who died sanctifying G-d's name at Tree of Life-Ohr L'Simcha."

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

Post-it note with handwritten message in black marker. The note is written: "Heartbroken with all of you."

Post-it note with handwritten message in blue ink. The message reads: "Stronger than hate." Illustrated with a peace symbol. Color bleeding and staining due to exposure to the elements at the Wilkins memorial.

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 has faded due to water damage; the remaining text reads: "Hello we would like to send some thoughts, love, and positivity during this time because you matter." The church's contact information is included on the back of the envelope.

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."

Post-it note with handwritten message in blue marker. The message reads: "Stronger Than Hate. Rachel [last name redacted]." A Star of David appears in the lower left corner.

Card addressed to David Rosenthal. Cover features a reproduction of a painting by Frank Crosby, a resident of the Emmaus Community of Pittsburgh. The inside contains messages of love and support written by other members of the Emmaus Community.

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, I'm sorry for your loss. Hope everything goes well. From Bella [last name redacted]."

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.

Hallmark card from a member of St. Peter's Episcopal Church in Londonderry, New Hampshire. The inside reads: "Please know that you are in our thoughts and prayers. St. Peter's Episcopal Church Londonderry, NH."

Typed copy of Professor Marc Brettler's address to his students at Duke University the Tuesday following the October 27 attack. This address was delivered by two people from Durham, North Carolina: Francis and Joanna [last names redacted].

Folded card on yellow paper with red and green stains. Due to exposure to the elements at the Wilkins memorial, the message on this card is no longer visible.

Typed note from the members and friends of First Presbyterian Church in Jamestown, Ny. The text of Psalm 23 appears below. Extensive staining due to exposure to the elements at the Wilkins memorial.

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

Miniature New York State flag. Wrapped around stem of flag is a slip of laminated yellow paper reading, "In Memory of our Brother In Memory of our Brother SYLVAN SIMON z''l -- To his family and community we pray Tanuchamo min hashamayim. May God in Heaven comfort you. The Principals, Teachers, Parents, Alumni, and Students of Magen David Yeshivah. Brooklyn, NY." Part of a series of 11 flags, each dedicated to one of the victims. Additional photograph shows the entire set of 11.

Typed letter from a student at Hebrew Academy, a private Jewish day school in Montreal, Quebec. The letter reads: "Dear Rabbi, My name is Joelle. I'm 10 years old. I live in Montreal. I go to Hebrew Academy, a private school. I'm sorry to hear that there was a shooting. I feel so bad. It doesn't matter what religion you are, you have to respect other[s] just the same way you have to respect Hashem (God). We should always know that we are stronger than hate. So bad things can't happen we have to faith and emunah (trust) in Hashem. I feel so bad. From: Joelle. P.S.

Card made by a student from the George Washington University Hillel. Front cover reads: "We Are One" with an illustrated heart below. The inside reads: "The GW community sends prayers and holds your community in our hearts. We will find a way to come out stronger."