Post-it note with handwritten message in blue marker. The message reads: "As a result of this hate, I'm committing to discovering my Jewish identity and am doing micro-kindness."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a pineapple with floral and geometric motifs. The back contains a handwritten note with a quote from the nineteenth century American poet Emily Dickinson, as well as the stock signature: "From your friends at West Allegheny Middle School."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Don't Stop Believing." The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Folded card with colored pencil illustration. Cover shows four smiley faces, two heart shaped balloons, surrounded by asterisk-shaped stars on a multicolored background. Inside reads: "Our prayers are with you! I hope you are well!" Back reads "2018" and features two heart shaped ballons in the lower center atop a salmon colored background.

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 blessings and affirmations of love. The church's contact information is included on the back of the envelope.

Card from the Friendship Circle of Illinois. The front cover of the card reads: "To the Jewish community of Pittsburgh sheyichyu (may they live)." The card reads: "I feel so bad for you from now and there should be no more bad stuff and moshiach (the Messiah) should come right now!" The acronym "B"SD" (with the help of heaven) appears on the upper right corner of the left fold. There are two illustrations of large smiley faces wearing t-shirts with smiley faces and yarmulkes (skullcaps) with the Hebrew word moshiach (the Messiah).

Notecard with green line on the right which reads: "This was wrong and shouldn't have happened. Our hearts go out to you. We know that love is stronger than hate."

Handwritten card from a student at Goddard Middle School in Littleton, Co. Front cover contains the following quote: "Never regret a day in your life. Good days give you happiness and bad days give you experience." Shows three small Stars of David on the far left and a cartoonish illustration of a stick figure pushing a pull with a Star of David on top of a heart up a hill on the center right. Inside reads: "Dear Tree of Life Congregation, My name is Yahir [last named redacted] and we heard what happened and we want you to [k]now that we pray for you.

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 shell, legs, and neck. The back contains a handwritten note and a sticker with blue text reading: "Stronger Together." The stock signature: "From your friends at West Allegheny Middle School" appears in the lower center.

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 contains an illustrated tree surrounded by hearts. The tree is labeled "Tree of Life" on the branches and "Synagogue" below. The card reads: "Tree of Life, I am so sorry for your loss. We will pray and keep you in our thoughts and prayers. We will continue to pray for you at the nights come. Have a great day! Love, Natalie T. Holy Angels CCD, 6th grade."

Folded card with marker illustration. Front and back cover features illustration of tree with heart superimposed on it. Interior features heart with X in center and words "We're all in this together. Things will get better. You're not alone."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated Nov. 4, '18 and reads: "We are so sorry to learn of the horrible tragedy that has befallen your church. Please know that we at Point Loma Pres. in San Diego are with you in prayer always and that God will always make things right in His own time and way. Stay strong in His word and trust Him to heal your hearts. In this we pray and support you from afar. Eric [last name redacted] PLPC."

Typed memorial note in honor of Richard Gottfried. The author recalls personal details about Gottfried's identity as a Jew and his commitment to the field of dentistry.

Post-it note with handwritten message in pink marker. The message reads: "Our hearts cry with yours for shalom." Signed with a heart, cross, and Star of David.

Post-it note with handwritten message in blue ink. The message reads: "Full recovery for all injured."

Typed floral tag from Chestnut Hills Dental. Tape placed over printed message; staple on the right. Creasing due to exposure to the elements at the Wilkins memorial.

Post-it note with handwritten message in blue marker. The message reads, in Hebrew: "Shalom" (Peace). Signed with a heart.

Typed letter on Alfred University letterhead in hardback certificate holder, signed by Alfred University President Mark Zupan.

Post-it note with handwritten message in blue marker. The message reads: "Love not hate." Tape affixed on the bottom edge. Tearing and creasing due to exposure to the elements at the Wilkins memorial.