Reviews of Books. Issue 4 (21st April 2019) - Maura, Juan Francisco; Kluge, Sofie; Jones, John A.; Fajardo, Salvador J.; Fajardo, Salvador J.; Dadson, Trevor J.; McCaw, R. John; Rallo Gruss, Asunción; Cruickshank, Don W.; Marín Pina, Mª Carmen; Heneghan, Dorota; Dorca, Toni; et al.