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.

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.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear Members of the Tree of Life Synagogue- My thoughts and prayers are with you as you grieve the loss of 11 of your friends, family, and members. The members of my church, Point Loma Community Presbyterian Church in San Diego, California have been praying for your congregation. We hope and pray that over time your hearts will heal and peace will enter to fill the void left by the 11. El."

Post-it note with handwritten message in black marker. The message reads: "Share the Love! Free Bouquets!"

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."

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 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: "We are praying for you. May God guide you through. Love, you[r] friend at Holy Angels." Spelling errors corrected for clarity.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated 11/4 and reads: "God loves you- We love you- Have strength in the LORD. Ken [last name redacted]."

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]."

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."

Note in black ink on cardboard reading: "I do not have much and I have fallen far from the faith but I stand with you. I pray for you. I love you not because of Religion or faith but because we are All Human. - A Mother."

Drawing in colored pencil on paper. Signed: "Rhea" lower center on the front; illustrated above with four-legged animal, perhaps a dog. Additional colored illustrations appear on the back. Extensive tearing and creasing due to exposure to the elements at the Wilkins memorial; the drawing is now torn into two pieces.

Folded card on white paper. Extensive dirt staining. Due to exposure to the elements at the Wilkins memorial, the message on this card is no longer visible.

Note from a member of The Church at Severn Run in Severn, Maryland. The note reads: "Dear friend, I am so joyful that you exist! As the well-loved child of God, you have an infinite worth and deserve so much love. My prayer is that you begin or continue to understand this throughout your life. May your life continue to be blessed. I love you! Love, Your friend from the Church at Severn Run."

Post-it note with handwritten message in black ink. The message reads: "Etz Chaim Hi. It is a tree of life for those who hold fast to it."

Laminated mixed media collage with paper, dried leaves, and marker. Tree in the center; two clouds and sun in upper register. Handwritten inscriptions in various marker colors on tree trunk and upper center. Extensive bleeding to back and signs of water exposure; creasing.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration a flower with geometric motifs. 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 Sister BERNICE 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.