Spanish language reference site for K-8 students.
This resource requires authentication for remote access.
Middle School
Online Resources
Britannica Escolar
Gale In Context: High School 
Many kinds of media sources for middle school and older students.
NoveList K-8 Plus
Summaries and reviews of current books for kids and teens.
World Book Enciclopedia Estudiantil Hallazgos eBooks
Spanish encyclopedia.
World Book Online eBooks
Ebooks and encyclopedia for grades K-12.