What is square?

Pictures and simple text identify various square objects.

HarperFestival
1999
9780694012077
book
Beginning Reading

Holdings

hidmidmiidnidwidlocation_codelocationbarcodecallnumdeweycreatedupdated
196224355472292450260542376358GRBS235GRBS007832516 DOT51615825759371742569409
251416160298122423260542376358SOE417SOP0015923516 DOT51616377825731736800991