TY  - BOOK
AU  - Koba,Susan
AU  - Tweed,Anne
TI  - Hard-to-teach biology concepts: designing instruction aligned to the NGSS 
SN  - 9789386105851
U1  - 570.76 23
PY  - 2017///
CY  - New Delhi
PB  - Viva Books
KW  - Biology
KW  - Study and teaching (Secondary)
ER  -