1. INTRODUCTION
1.1. The Photodissociation Region
2.2. CARMA and BIMA
2.3. APEX
2.4. Ancillary Data
3. RESULTS
3.1. P1
3.5. P3
3.6. Ridge
3.7. P4
3.8. Summary and Geometry
4. PHOTODISSOCIATION REGIONS
4.1. Morphology and Geometry of the Major PDRs
4.2. Sources of Illumination
4.3. Modeling PDRs Towards the Pillars
5. MASS AND PHYSICAL CONDITIONS
5.1. Molecular and Atomic Hydrogen Column Densities
5.3. Pressure Balance
5.4. Ambipolar Diffusion and Molecular Cloud Collapse
5.5. Constraints on Pillar Age
6. DISCUSSION
6.1. Warm Gas Dynamics
6.2. Pillar Lifetimes
7. CONCLUSION