bibliographic entry 3950160 [be/3950160]
https://w3id.org/oc/corpus/be/3950160

is a

• bibliographic reference

content

• Kahle D, Wickham H. ggmap: Spatial Visualization with ggplot2. The R Journal. 2013; 5(1): 144–161.

references

• https://w3id.org/oc/corpus/br/3867184