1 INTRODUCTION

2 DATA & METHODOLOGY
2.1 Sample Selection
2.2 Data Acquisition and Reduction
2.3 New DLA and Super Lyman Limit System (SLLS) Discoveries

3 COLUMN DENSITY AND METALLICITY MEASUREMENTS
3.1 N(H I) and [M / H] Measurements
3.2 The Influence of Medium-Resolution Spectra in Determining [M / H]: Applying Flux-based Saturation Corrections

4 COSMIC METALLICITY EVOLUTION OVER REDSHIFTS z=2.2-4.4
4.1 How different are the Magellan and R12 samples?
4.2 Assessment of Potential Biases
4.3 Conclusions on Metallicity Evolution

5 OTHER DLA DIAGNOSTICS
5.1 Δν90
5.2 Wλ1526 and Wλ1548
5.3 Mg II λ 2796 Equivalent Width versus [M/H] and NHI

6 CONCLUSIONS