1. INTRODUCTION

2. SOURCE SELECTION AND DISTANCES
2.1. Distances

3. OBSERVATIONS

4. DATA ANALYSIS
4.1. Data
4.2. Summary of BML Region Algorithm
4.3. Criteria for Possible Interactions
4.4. BML Region Identification
4.5. BML Region Examples: 3C 391 and Cas A
4.6. Comparison to Other BML Region Indicators

5. RESULTS
5.1. SNRs with Previous Detections Supporting SNR-MC Interactions
5.2. Non-Detection Toward G54.1+0.3
5.3. Newly Identified SNR-MC Systems

6. DISCUSSION
6.1. The SNR-MC Interaction Rate
6.2. To What Extent Are SNR-MC Interactions Detectable in 12CO J=2-1?
6.3. Suppressing the SNR-MC Interaction Rate
6.4. Astrophysical Implications of a Low SNR-MC Interaction Rate
6.5. Gamma-Ray Emission from SNR-MC Interactions

7. CONCLUSION