Mark, thank you for your reasoned responses throughout this thread. I appreciate your insight and analysis of this and other photos that have been presented through the years. I have unfortunately allowed my SABR membership to lapse, but if you have a short list of any resources or in print or online that are readily-accessible or easily-purchased for someone interested in learning and correctly-applying the basic techniques you describe, could you give a good "Recommended Reading" list for beginners? Thanks!
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