DALLAS, Sept. 12, 2019 (GLOBE NEWSWIRE) -- Voyager Sopris Learning reported today a significant increase in the number of schools, districts, and states using LETRS , the company’s landmark professional development that provides educators with the background, depth of knowledge, and tools to teach language and literacy skills to every student. Authored by Dr. Louisa C. Moats and Dr. Carol A. Tolman, LETRS (Language Essentials for Teachers of Reading and Spelling) for elementary school teachers...