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Echocardiography:
Hemodynamic Monitoring Using Echocardiography in the Critically Ill
A game changer
Echocardiography for Intensivists
Making Sense of Echocardiography
All you need to know for the TTE exam without the extras
Feigenbaum's Echocardiography
Complete echo textbook
Whole Body Ultrasonography in the Critically Ill
The text for lung ultrasound and you get everything else too
General:
Practical Ultrasound. An Illustrated Guide
The best starting point for everything other than heart and lungs