open books on white background
Palabras clave
article,
background,
big,
book,
collection,
concept,
datum,
document,
education,
cyclopaedia,
hardcover,
heap,
history,
image,
information,
isolated,
cognition,
learning,
library,
literary,
literature,
nobody,
object,
open,
page,
paper,
pile,
publication,
reading,
research,
school,
science,
stack,
stacked,
story,
study,
studying,
text,
textbook,
university,
volume,
white,
wisdom,
write
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