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Going North (Bccb Blue Ribbon Picture Book Awards (Awards)) by Janice N. Harrington http://www.amazon.com/dp/0374326819/ref=cm_sw_r_pi_dp_7nSpub125N9K3

Snowflake Bentley by Jacqueline Briggs Martin http://www.amazon.com/dp/0547248296/ref=cm_sw_r_pi_dp_kG-pub08CWYR8 Photographer of snowflakes. weather unit?

The Boy Who Loved Math: The Improbable Life of Paul Erdos by Deborah Heiligman http://www.amazon.com/dp/1596433078/ref=cm_sw_r_pi_dp_p88Fub0FA8D7D

Ruth and the Green Book by Calvin Alexander Ramsey http://www.amazon.com/dp/0761352554/ref=cm_sw_r_pi_dp_tQ57ub0F42H1K