00331nam a22001337a 4500 SGT 617.632 C21C Chugh, Alisha Classification of Periodontal diseases Gurugram, Haryana SGT University 2021 Periodontology Periodontology ddc TH 0 0 ddc 0 1 FD FD 2024-01-16 SGTU 0 617.632 C21C DT1775 2024-01-16 00:00:00 2024-01-16 TH 25624 25624