1. Introduction

2. Observations and Data Processing
2.1. Survey Design
2.2. Data Reduction
2.3. Ancillary Data

3. Source Search and Characterization
3.1. 1.2-mm Continuum-Selected Candidates
3.2. CO(4–3) Line-Emitting Candidates
3.3. 3-mm Continuum-Selected Candidates
3.4. Completeness and Flux Boosting
3.5. Identification of Interlopers Across the Redshift Range
3.6. Source Fluxes and Luminosities

4. Results
4.1. CO Luminosity Function Analysis
4.2. 1.2-mm Continuum Source Number Counts

5. Discussion
5.1. The Overdensity in MQN01
5.2. Molecular Gas Density in MQN01 Field
5.3. Comparison with (Sub-)mm Surveys of High-z Proto Clusters
5.4. Is MQN01 a Proto Cluster in Formation?

6. Summary and Conclusions