NCTM ዓመታዊ ስብሰባ እና ኤግዚቢሽን

በዋሽንግተን ዲሲ - ዋሽንግተን ዲሲ፣ ኮሎምቢያ ዲስትሪክት፣ አሜሪካ

በ Canton Fair Net ተለጠፈ

https://www.nctm.org/Conferences-and-Professional-Development/Annual-Meeting-and-Exposition/Past-and-Future-Annual-Meetings/