. of knowledge: a pile of books

background book business cartoon college collection copybook dictionary document drawing educate education encyclopedia graphic handbook heap historic history homework icon information intelligence isolated knowledge learn lesson library literature notebook notepad pictogram pile read school science sign sketchbook stack student study symbol textbook university vector wisdom workbook ancient publication publish knowledge: books close view old diary teach write note page set retro data class sketch art line hand drawn antiqu literary blank closeup print novel tale group logo white