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1.
Improved Form of Electrocardiograph : And Preliminary Report on the Use of an Improved Form ... by Caldwell, Samuel Hawks, Ole... ISBN: 9781258627577 List Price: $35.95
2.
An Improved Form Of Electrocardiograph: And Preliminary Report On The Use Of An Improved For... by Samuel Hawks Caldwell, C. B... ISBN: 9781258633011 List Price: $20.95