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.

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

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, Although I am a Presbyterian, I have Jewish ancestors. I was so saddened by the tragedy your congregation has [?]. May you have the blessings of the Lord, and may the ones you have lost rest in peace. William H. [last name redacted] San Diego, CA."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a bird with a leaf in its mouth and 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.

Handwritten card in red marker, addressed broadly to tvarious groups impacted by the October 27 attack, including the congregation, the victims and their families, witnesses, police, and first responders. Signed by several families [last names redacted]. The front cover features a reproduction of an eighteenth century engraving of a white heron in the collection of Colonial Williamsburg in Williamsburg, Va.

Card addressed to Richard Gottfried, written using personal details from various public sources.

Handmade card in colored marker on paper. The card reads: "Love" and is illustrated with a heart below. Mild dirt stains throughout. The card has been laminated.

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.

Miniature New York State flag. Wrapped around stem of flag is a slip of laminated yellow paper reading, "In Memory of our Brother DAVID ROSENTHAL 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.

Handwritten card in red marker on paper. The card is signed: "Owen" and contains two illustrated stick figures.

Clear ribbed glass bottle with packing tape around base. Dirt and small leaf stuck to tape. Bottle contains a variety of synthetic flowers and greenery including sunflowers, oak leaves, grass, and glitter-covered poinsettias.

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 the stock signature: "From your friends at West Allegheny Middle School."

Print outs with English and Hebrew lyrics from popular Jewish and Israeli artists and poets, including Hannah Szenes (Senesh), Arik Einstein, Matisyahu, and Rabbi Nachman of Breslov. A handwritten note in blue ink reading "May your memory be eternal" appears on the second page.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "To Members of Tree of Life and your community, We stand with you! I am praying for spiritual and physical healing for those who were injured or affected by the awful act of hatred directed at you. We serve an all-powerful God of mercy and love and I pray that you are comforted knowing that there are many who are lifting prayers on your behalf. May you as a community of faith be encouraged and healed. Pam [last name redacted]."

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 condolence and a wish for peace, articulated through citations to the Book of Psalms. The church's contact information is included on the back of the envelope.

Handwritten note written in yellow marker on a printed paper with a framed picture with leaves around the edges. The note is written inside the leaf frame and reads: "Eleven beautiful leaves for eleven beautiful sweet souls ripped away... Six strong trees for the six injured but here to stay. Hated can't weaken a city of steel."