Stack of books on white background
Palabras clave
three-dimensional,
flat,
symbol,
vector,
book,
isometric,
business,
collection,
concept,
course,
design,
education,
electronic,
graphic,
icon,
idea,
information,
cyberspace,
cognition,
learn,
object,
school,
science,
set,
signs,
stack,
student,
study,
teaching,
textbook,
training,
tutorial,
university,
web
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