## CombinatoricsThis volume is a record of the papers presented to the fourth British Combinatorial Conference held in Aberystwyth in July 1973. Contributors from all over the world took part and the result is a very useful and up-to-date account of what is happening in the field of combinatorics. A section of problems illustrates some of the topics in need of further investigation. |

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### Contents

On a theorem of R A Liebler | 53 |

spanning trees | 61 |

numbers | 83 |

squares | 89 |

restrictions | 97 |

Lovasz and M D Plummer On a family of planar | 103 |

P Miller On the enumeration of partially ordered | 109 |

J W Moon The distance between nodes in recursive | 125 |

R Nelson | 133 |

37 | 174 |

Copyright | |