TY  - BOOK
AU  - Marriott,Henry J.L.
TI  - Practical electrocardiography
SN  - 0683055720
U1  - 616.1207547 
PY  - 1972///]
CY  - Baltimore
PB  - Williams & Wilkins
KW  - Electrocardiography
N1  - "Guide for rapid and easy estimation rate": ruler in pocket
ER  -