# What has the author J Delboeuf written?

J. Delboeuf has written:

'Essai de logique scientifique' -- subject(s): Logic, Symbolic and mathematical, Symbolic and mathematical Logic

### What has the author J J O'Kane written?

J. J. O'Kane has written: 'Parental involvement in education'

### What has the author J J Christensen written?

J. J. Christensen has written: 'Stalk rot of corn'

### What has the author J J Leeming written?

J. J. Leeming has written: 'Statistical methods of engineers'