Lois Lenski
In addition to illustrating her own books , Lenski also provided illustrations for texts by other authors , including the first edition of "The Little Engine that Could" , by Watty Piper ( 1930 ) , and the first four volumes of Maud Hart Lovelace's "Betsy-Tacy" series ( 1940-1943 ) . 
<triplet> Maud Hart Lovelace <subj> Betsy-Tacy <obj> notable work