1 INTRODUCTION
2 DATA
2.1 Imaging Surveys
2.2 Spectroscopic Surveys
3 OPTIMIZING QSO SELECTION VIA 2QDES $^+$ WHDF
3.1 2QDESp QSO Selection
3.2 William Herschel Deep Field (WHDF) QSO Selection
3.3 WHDF Selection Summary and Conclusions
4 VST-ATLAS QSO SELECTION
5 SPECTROSCOPIC COMPLETENESS AND EFFICIENCY OF THE VST-ATLAS QSO SELECTION
5.1 DESI Comparison
5.2 2dF Comparison
5.3 2QZ, 2QDES, eBOSS Comparison
5.4 Spectroscopic Analysis Conclusions
6 FINAL ATLAS QSO CATALOGUE
7 ANNZ2 PHOTOMETRIC REDSHIFT ESTIMATION
7.1 ANNz2 Training
7.2 Photometric Redshift Samples
8 CONCLUSIONS
8.1 QSO Statistics in the Full ATLAS Catalogue
8.2 QSO Statistics in ATLAS Catalogues Split at $z_{\mathrm{photo}}=2.2$
8.3 Future Applications of the VST ATLAS QSO Catalogues