Dear Editor Herewith I re-send you a manuscript of research paper entitled, The Hydrogeology of Ciliwung River Streams, Segment Bogor – Jakarta, Indonesia This paper was written by: Irawan, D.E. 1 , Brahmantyo, B. 1 , Puradimaja, D.J. 1 , Silaen, H. 1 , Lubis, R.F. 2 1 Applied Geology Research Group, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Indonesia - Jl. Ganesa 10, Bandung, West Java, Indonesia, Tel: +62 22 251 4990; Fax: +62 22 251 4837, correspondence, email: erwin@fitb.itb.ac.id 2 Geotechnology Division, Indonesia Foundation of Science This is an original research paper, that has not been submitted to other journal or periodicals. The research was conducted in 2006, but it is still reflecting the existing condition at the Ciliwung River Streams. Therefore, we are hoping that this paper can be considered to be reviewed for publication. Hopefully, we can receive your review soon. Thank you. Best regards D. Erwin Irawan First/corresponding author Cover Letter