What medium is "Mrs. Daniel Strobel, Jr. (Anna Church Strobel) and Her Son, George"?

Mrs. Daniel Strobel, Jr. (Anna Church Strobel) and Her Son, George is Probably Conté crayon on off-white wove paper.

Is "Mrs. Daniel Strobel, Jr. (Anna Church Strobel) and Her Son, George" in the public domain?

Yes, Mrs. Daniel Strobel, Jr. (Anna Church Strobel) and Her Son, George is in the public domain and available for free download under CC0 license.

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This artwork was created ca. 1799.

John Vanderlyn, ca. 1799